Wi-Fi connection, easy to install, no need to consider line problems, safe and convenient. The alarm's LED indicator lights up in red  and strobes, and an audible alarm is sent to the Tuya or smart home APP via the WiFi network. After the air is fresh and clean, it will stop the alarm and return to the low-power state of normal monitoring. Mute function: During the alarm process, press the test button tomute the device, leaving only the flashing led light. When the battery is low, the alarm will sound an alarm to remind you to replace the battery in time.

Specifications
power supply:    DC3V bettery
Standby current:    <12uA
Alarm current:    <35mA
Low voltage threshold:    4.8V
Product lifespan:    10 year
battery for wifi base:    DC6Volt battery,3-5years lifespan,replaceable
Alarm mode:    Siren with Flash(Red LED &buzzer )+APP notificatin
Alarm sound:    <85dB/3M
Wifi working standard:    2.4G Hz 802.111b /g / n
APP:    TUYA smart
Execute Criterion:     EN14604:2005/AC：2008
Material:    ABS fireproof material
Installation method:    ceiling mounted
Product size:       Ø110mm×H57.15mm
single packing size:                132mm*123mm*68mm