DSC WS4936 Wireless smoke and temperature rise detector

Automatic drift compensation
Built-in dual-sensor smoke sensor with fixed temperature and rise rate
Built-in 85 dB siren
Local test button
Low profile construction
High/low sensitivity reporting
Low battery indication
Easy to maintain removable smoke chamber
Non-contact sensitivity reading with handheld tester (FSD-100)
Long lasting lithium batteries included
EN/UL/ULC listed for home applications
Reliable 433 MHz technology