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Echo (Receive)
Operating Voltage: 4
Before applying power to your Arduino board
The TCRT5000L are reflective sensors which include an infrared emitter and phototransistor in a leaded package which blocks visible light
the CCS811 can save material inventory costs of the device
Mini FM Transmitter Wireless Microphone Surveillance Small Motor Echo (Receive)Operating Voltage: DC 2V 9V Current: 9mA (3V voltage Reference distance: open ground 100 meters, 10 30 meters indoor environmental obstacles (3v voltage test, increasing the voltage from the greatly increased) Operating frequency: 85MHZ 115MHZ (usually between 99 101 boot default frequency) Receive way: as long as the 88 108MHz FM radio can receive, with FM feature phones. Frequency adjustment: adjustable capacitor Output Impedance: 50 ohms Size: 2 cm