① no wiring, installation is simple ② dedicated MCU intelligent control, smoke-sensitive automatic inspection ③, undervoltage detection technology tips ④ ⑤ triple proprietary protocol analysis, strong anti ⑥ a battery to work effectively for more than 2 years ⑦ transmission power, Fire Gateway with supporting the use of 8) to protect the area from 40 to 60 m ☆ Temperature: -10 ~ 45 ℃ ☆ Relative humidity: 5% ~ 95% ☆ Power supply: 9VDC ☆ Standby current: <15μA ☆ Alarm current: 85dbA ☆ protection Size: 40 ~ 60m2 ☆ transmit power: ≥7dbM ☆ Shell: flame retardant ABS