Wireless smoke alarm system UL217 standard home security system

MD-2105R Smoke Alarm is meian tech FOCUS brand professional home and business wireless security system. 
New style voice prompt for low battery wireless smoke alarm works with Focus brand wireless alarm panel and remotes.
easy to install on ceiling or wall using the screws with countersink heads which had packed in the package.

Features:
1.thermistor sensor / photoelectric infrared LED
2.smog sensitivity comply with UI 217 / 3.2%/feet
3.sent status signal every 15 seconds or 65 seconds
4.no emit radioactive element
5.auto send signal when low power voltage or re-setting
6.built-in buzzer make once sound in each 2 hours when battery low voltage
7.self-testing indication: infrared LED turn on and then make 2 buzzer sound
8.alarm indication: infrared LED turn on and around 30 seonds buzzer sound at the same time
9.power input: 6VDC (CR123A 3.0V Lithium Battery x 2pcs)
10.static current is 20mA ~40mA/ alarm current is 20mA
11.alarm volume: 85dB at the distance of 10 feet
12.operating environment: -5C ~ +50C / humidity: 10% ~90%
13.wireless emitting frequency: 433MHz / 868MHz (for optional)
14.wireless emitting range is 100m (in open area)
15.dimension is Diameter 105mm / ivory white color