... Security Alarm , heat alarm HD-912 provide fast and reliable response for heat 57C (135F) detection, UL521 and EN54-5 approved Security Alarm ... ,heat detector, heat alarm with fixed and rate-of-rising ... temperature heat detector, heat alarm Feartures:1)2 or 4 wire modles2 ... with baseWeight:120g/set with base, Security Alarm with UL,EN and CE