We are highly engaged in providing the best quality range of Wireless Photoelectric Smoke Detector System as per the varied needs of the clients. Features: Automatic drift compensation Built-in, dual-sensor heat detector with fixed heat and rate of rise (non UL listed) Built-in 85dB horn Local test button Low profile design HighLow sensitivity reporting Low battery indication Easy-maintenance removable smoke chamber Non-contact sensitivity reading with handheld test meter (FSD-100) Long-life lithium batteries included Reliable 433 MHz and 868 MHz technology