low battery warning smoke alarm

fire prevention smoke alarm direct from Wanlin Fire Protection — 12-year factory experience, WL-SM608 fully certified CE/EN14604/FCC/RoHS/REACH. Key specs: 4G LTE Cat.1 wireless, 10s alert push via APP/SMS/call, 10-year sealed lithium battery, CE/EN14604/FCC certified. MOQ 200pcs, 20-25 working days, OEM/ODM custom branding available. Serving 60+ countries ···