WiFi+GSM Home Smart Alarm 433MHz Wireless Home Security Alarm System LCD

Wireless Frequency: 433MHz. Alarm Panel Battery: Li ion DC 3.7V 500mAh (Included). Wireless Standard: IEEE802.11b/g/n 2.4G. PIR Sensor Battery: 3 x 3A Battery 1.5V (Included). Door Sensor Battery: 1xCR2450 3V (Included).

eBay