I couldn’t find a verified or official document titled in public or technical databases. The model number “Brj-502” does not correspond to a widely recognized product as of my current knowledge (e.g., no major electronics, industrial equipment, or consumer device brand uses that exact code).
: Install the unit 1 foot (0.3m) above the floor and within a 5-foot (1.5m) radius of the gas source. Alarm Levels and Indicators Brj-502 Manual
: Wipe the exterior with a soft, dry cloth. Do not spray cleaning chemicals, insect sprays, or silicones directly on or near the detector, as these can damage the sensor or cause false alarms. Power Outages : Most models are strictly plug-in and do not have a battery backup . If the power goes out, the device will not function. I couldn’t find a verified or official document
: After plugging it in, the device requires a 3–5 minute warm-up period before it can accurately detect gas. Alarm Levels and Indicators : Wipe the exterior