Wireless Door Gap Detector-MC-03B

Zhuhai Hoyma Technology Co.,Ltd.
Zhuhai Hoyma Technology Co.,Ltd.
Zhuhai Hoyma Technology Co.,Ltd.
Zhuhai Hoyma Technology Co.,Ltd.
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  • • Dual alarm: Door‑contact anti‑theft & SOS emergency button
  • • Up to 2‑year battery life (CR2032 lithium battery)
  • • Low‑battery LED reminder, host alert supported
  • • 80m open‑area wireless range; multi‑frequency & code compatibility
  • • Wide working condition: ‑15℃~+50℃, humidity ≤90%
  • • Easy installation with tape, no wiring
  • • LED indicator for real‑time status
  • • Sensitive trigger when gap over 15mm

Power supply: DC 3V (CR2032 Li battery)

Standby current: <2uA

Alarm current: 15   mA

Low electric voltage: 2.2V

Emitting code: 1527/2262

Emitting distance: no obstacle 80M

Working Temperature: -15°C ~ +50°C

Humidity: 90%

Emitting frequency: 315/433.92/868MHz


Alarm type

How to trigger alarm

Door contact performance

SOS alarm

Press SOS button

Door sensor send RF signal to control panel, red LED will flash, and went out   

after signal sending.

Door alarm

The magnetic bar and the transmitter are 

separated with a distance over 15mm.

Send door open alarm signal to alarm control panel, red LED will flash, and went   

out after signal sending.

Low power reminding

The battery power is less than 2.2V

The product automatically detects the battery power. The product trigger the door   

alarm and send a low power alarm message when low power. After that, the   

light flashes twice every 10 seconds, indicating low power.

Note: please change battery when low power, to ensure working well.


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