Wireless High-Performance Portable Remote Control 4 Buttons For KERUI GSM PSTN Home Alarm System This item must work with the alarm system, it can not work independently. ■ Power supply: 2 CR2016 button batteries ■ Modulation method: ASK ■ Wireless frequency: 433MHZ ■ launch distance: 100M (open space) ■ Encoding...
