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BUZ-101 PCB Mount Passive Buzzer With Needle
US$1.36
Passive buzzer can produce different tones according to sound control signal. For example you can use arduino to make the buzzer produce different sound tones. Unlike the active buzzer which produce fixed tone when you just give power. 
 
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BUZ-12054P Passive Piezoelectric Buzzer 44x14mm , with Wires
US$1.36
This is nicely enclosed with wiring so you can attach easily. Piezo elements convert vibration to voltage or voltage to vibration. That means you can use this as a buzzer for making beeps, tones and alerts and you can use it as a sensor, to detect fast movements like knocks. Unlike the active buzzer that only requires a constant voltage this passive buzzer will need a microcontroller to help it run. It is like an electromagnetic speaker, where a changing input signal produces the sound, rather than producing a tone automatically.
 
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ME-3015 3015 Noise Reduction Microphone With Wire
US$2.08
Noise-cancelling microphones are built to pick up your voice while ignoring the background noise. After high temperature reflow soldering, the conventional sensitivity is kept at ±1.5 DB floating range, far exceeding the industry's 3 DB standard. 
 
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ME-4015 4015 Electret Condenser Microphone
US$1.17

Electret microphones enable communication and recording in devices including telephones, smartphones, desktop computers, headsets, recording systems and more. 

 

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ME-45 4.5*2.2mm Electret Condenser Microphone Sensitivity 52DB
US$0.41
Electret condenser microphone, back electret type, small in size, in general use. An acoustic-to-electric transducer or a sensor that converts sound into an electrical signal. Widely applied to telephone, mobile phone, MP3, MP4, laptop, digital camera, intercom, monitor, etc.
 
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BUZ-SFM-20B 22mm DC3-24V continuous sounder buzzer
US$1.72

This piezoelectric device makes continuous sound when a voltage is applied. 

 

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BUZ-232 Mini Buzzer With Dupont Connector
US$0.90

This is a PC internal BIOS motherboard small speakers alarm dupont head computer case buzzer speaker.  

 

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AM-121AB Active Buzzer Driver Module Alarm Device Sensor with wires
US$2.99

An active buzzer with a concussion internal source- so long as it will be called an energized. Program easy to control- SCM can let a high-low sound- while passive buzzer did not.

 

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PBS-LED-2224Y-L, 12-24V 22mm Waterproof Latching Pushbutton Switch with Yellow LED Ring
US$8.00
These illuminated waterproof chrome-plated metal pushbuttons give a professional appearance to any project. When you press it the 'normally-open' contact shorts to the common contact and the ‘normally closed’ contact button opens. The contacts will stay in this position momentarily until the button is released. Waterproofing is provided with a rubber O-ring. On the front of the button is a flat metal actuator, surrounded by a plastic LED ring. On the back there are 3 contacts for the switch; C (common), NO (normally open) and NC (normally closed) and 2 contacts for the LED ring (+ and -). Connect 12-24VDC to the LED ring to have it light up nicely, there's a built in resistor!
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PBS-LED-2224WH-L, 12-24V 22mm Waterproof Latching Pushbutton Switch with White LED Ring
US$8.00
These illuminated waterproof chrome-plated metal pushbuttons give a professional appearance to any project. When you press it the 'normally-open' contact shorts to the common contact and the ‘normally closed’ contact button opens. The contacts will stay in this position momentarily until the button is released. Waterproofing is provided with a rubber O-ring. On the front of the button is a flat metal actuator, surrounded by a plastic LED ring. On the back there are 3 contacts for the switch; C (common), NO (normally open) and NC (normally closed) and 2 contacts for the LED ring (+ and -). Connect 12-24VDC to the LED ring to have it light up nicely, there's a built in resistor!
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PBS-LED-2224RD-L, 12-24V 22mm Waterproof Latching Pushbutton Switch with Red LED Ring
US$8.00
These illuminated waterproof chrome-plated metal pushbuttons give a professional appearance to any project. When you press it the 'normally-open' contact shorts to the common contact and the ‘normally closed’ contact button opens. The contacts will stay in this position momentarily until the button is released. Waterproofing is provided with a rubber O-ring. On the front of the button is a flat metal actuator, surrounded by a plastic LED ring. On the back there are 3 contacts for the switch; C (common), NO (normally open) and NC (normally closed) and 2 contacts for the LED ring (+ and -). Connect 12-24VDC to the LED ring to have it light up nicely, there's a built in resistor!
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PBS-LED-2224GN-L, 12-24V 22mm Waterproof Latching Pushbutton Switch with Green LED Ring
US$8.00
These illuminated waterproof chrome-plated metal pushbuttons give a professional appearance to any project. When you press it the 'normally-open' contact shorts to the common contact and the ‘normally closed’ contact button opens. The contacts will stay in this position momentarily until the button is released. Waterproofing is provided with a rubber O-ring. On the front of the button is a flat metal actuator, surrounded by a plastic LED ring. On the back there are 3 contacts for the switch; C (common), NO (normally open) and NC (normally closed) and 2 contacts for the LED ring (+ and -). Connect 12-24VDC to the LED ring to have it light up nicely, there's a built in resistor!
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PBS-LED-2224BL-L, 12-24V 22mm Waterproof Latching Pushbutton Switch with Blue LED Ring
US$8.00
These illuminated waterproof chrome-plated metal pushbuttons give a professional appearance to any project. When you press it the 'normally-open' contact shorts to the common contact and the ‘normally closed’ contact button opens. The contacts will stay in this position momentarily until the button is released. Waterproofing is provided with a rubber O-ring. On the front of the button is a flat metal actuator, surrounded by a plastic LED ring. On the back there are 3 contacts for the switch; C (common), NO (normally open) and NC (normally closed) and 2 contacts for the LED ring (+ and -). Connect 12-24VDC to the LED ring to have it light up nicely, there's a built in resistor!
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PBS-LED-2206Y-L, 3-6V 22mm Waterproof Latching Pushbutton Switch with Yellow LED Ring
US$8.00
These illuminated waterproof chrome-plated metal pushbuttons give a professional appearance to any project. When you press it the 'normally-open' contact shorts to the common contact and the ‘normally closed’ contact button opens. The contacts will stay in this position momentarily until the button is released. Waterproofing is provided with a rubber O-ring. On the front of the button is a flat metal actuator, surrounded by a plastic LED ring. On the back there are 3 contacts for the switch; C (common), NO (normally open) and NC (normally closed) and 2 contacts for the LED ring (+ and -). Connect 3-6VDC to the LED ring to have it light up nicely, there's a built in resistor!
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PBS-LED-2206WH-L, 3-6V 22mm Waterproof Latching Pushbutton Switch with White LED Ring
US$8.00
These illuminated waterproof chrome-plated metal pushbuttons give a professional appearance to any project. When you press it the 'normally-open' contact shorts to the common contact and the ‘normally closed’ contact button opens. The contacts will stay in this position momentarily until the button is released. Waterproofing is provided with a rubber O-ring. On the front of the button is a flat metal actuator, surrounded by a plastic LED ring. On the back there are 3 contacts for the switch; C (common), NO (normally open) and NC (normally closed) and 2 contacts for the LED ring (+ and -). Connect 3-6VDC to the LED ring to have it light up nicely, there's a built in resistor!
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82 - 96
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98 - 112