wireless door sensor in 433MHZ frequency for home GSM alarms with alkaline battery

Model:JS-86W wireless door sensor

Features:
Unique, controlled by micro-computer
Detect door open and door close
Low-voltage indicator

Specifications:
Operating power: 23A 12V alkaline battery 
Frequency: 433MHZ
Emitting distance: greater than or equal to 150m (in open area)
Service life: less than or equal to 2 year
Alarm Distance: less than 4cm

Installation and Usage
Fix the part of magnet onto the door frame in a position of 1.6m above the ground to prevent any children
from bumping onto it
Fix the part of emitting onto the door frame, make sure to keep the part of magnet and part of emitting in parallel, the space between the two parts shall be less than 10mm
Open the battery door, and fix battery.
Upon the door open, Indicator would flash blue once, and send out signal to alarm host panel
When low-power, indicator would keep flash blue, it is to remind you to change battery.