Wireless emergency alarm button with remote switch wireless alarm 100db

Model: YK500-2
Operating voltage: 4.5V (button battery)
Encoding: learning code
Chip type: CS5880
Firing distance: 500 meters (open ground)
Operating current: 100mA, + 5mA
Remote control size: 86mm*86mm

Package List:

1*86*86 size remote switch

1*wireless alarm

1*power supply adapter