KERUI F51 433MHz Wireless SOS Button Emergency Alarm Doorbell Button For GSM PSTN Smart Home System

Features : Wireless waiter call button systems. Waterproof. One Button transmitter. Long receive distance 100M for open area. Specification : Working Voltage: 12V DC Standby Current: 5uA RF Frequency: 433 MHZ Transmitting Current: 15mA Operating Temperature: Indoor -10 to 50 Sending Distance: 100m (Open area) Package includeds : 1 x KERUI F51 Wireless SOS Button Details pictures :