▪ Used indoor of similar place, temperature:-10℃~+40℃,relative humidity:45-85%;                                                                                  

▪ Press transmitter, the receiver sends nice Ding-dong sound;

▪ Transmitter is powered by 12V battery, the receiver is powered by 2×1.5V AA batteries;                                                                   

▪ Quiescent current is not more than 0.35mA when the receiver is not working;                        

▪ Frequency 433.92MHz±150KHz;                                                        

▪ Transmits up to 100meters (open air)   

▪ CE Approval