Working Voltage: AC 100-240V
Working Current: < 100 mA
Wireless Frequency: 433 MHz
Working Temperature: -10-50 degree centigrade
Wireless Distance: 150 meters (Open area)
Button is Waterproof ,Don't worry about extended use
Long Battery Life
Up to 500ft Ultra-long Transmission Distance
Easy to install with the double side adhesive tape or the screws
Ringtones and 4 Adjustable Volumes
You can buy more and more quantities from my store in particular items. Shipment will process withing next 48 hours after the payment.