Burglar alarm failure and troubleshooting
Firstly, The central system failure. 1. The central machine can not receive all users alarm information. Possible causes: telephone line interference […]
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How to choose active infrared beams
There are different beams quantity such as 2 beams, 3 beams, 4 beams, 6 beams and 8 beams of photoelectric beam […]
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