WC588P (Not Available For North America) Wireless Carbon Monoxide Detector (made by Xiamen Vs-Top Electronics Co., Ltd.)

Highly sensitive electrochemical carbon monoxide 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 / Hush button
LED operation indicator
Low battery indicator
Easy installation
CE and EN 50291 certified