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It is one kind of sensor product which can be activated by touching it with hand or passing by it quickly and send out the recorded message left by other person to you .
Application place : can be placed on the doorknob , handrail etc.
Features Product Name: Hand Sensor Message Alert Device Model Number:RD-669 WMelodies: 6 seconds message recordable Remote Control: Working temperature:-20°C-50°CNo wiring, no installation Low power consumption: 3.29mwVolume > = 80dB Battery requirement: 3"AAA"PackingPacking: Blister,200 pieces/carton Carton measurement 58*47*45cm
hand touch sensor record gadgets