WH588P (Not Available For North America) Wireless Heat Detector (made by Xiamen Vs-Top Electronics Co., Ltd.)

Fixed temperature heat sensor
DC battery operated wireless alarm
Compact, low-profile design
Built-in siren
Available in 433MHz or 868MHz
Protection against the ingress of foreign bodies / Insect Guard
Anti-tamper sensor
Test button
LED operation indicator
Low battery indicator
Easy installation
CE certified