The Ajax FireProtect is a smart smoke/heat detector. Easy to assemble and beautifully designed.
 
Smoke detection
Heat detector -> Rapid temperature rise (even without smoke) immediately triggers an alarm
Enclosure is protected against sabotage
Confirm correct operation by ping every 5 minutes
Can also work autonomously as a regular smoke/heat detector (without Hub)
Warns the user when the smoke chamber needs to be cleaned
Battery life is up to 4 years
2-Way Communication via 868MHz
Power supply: CR123A battery
Equipped with built-in siren
Status of the detector can be read via the app
132 132 × 31mm