Buton de panica wireless DS-PDEB1-EG2-WE(B) Tri-X Wireless,Two-Way RF Wireless,868MHz, AES-128 Encryption, 1.2Km, LED Indicator Blue(Alarm), Power up,Remote ID,QR Code, 3 years in work status (being triggered 20 times per day), Battery Powered CR2450 x 1, 3V , Operation Temperature - 10 °C to 55 °C