Wireless Infrared Monitor Alarm Entry Doorbell Chime--White Reviewhttp://tinyurl.com/ks7hnta Wireless Infrared Monitor Alarm Entry Doorbell Chime--White Wireless installation, just place the sensor at the entranceInfrared sensor detects motion and sends a signal to the receiverReceiver requires 2x AA batteries, transmitter requires 1x 9V batterySend audible chime sound, alerting you that somebody is approachingMaterial: Plastic. Melody: for Alice
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