fire alarm battery replacement

smoke detector with SD card direct from Wanlin Fire Protection — 12-year factory experience, WL-MC100 4G smart fire protection product certified CE/FCC/RoHS/REACH/ISO9001. Key specs: 4G LTE + Break Glass Emergency Trigger, 4G LTE + SMS + Push + Phone Call + App + Siren Strobe Trigger. No monthly fees, 4G cellular backup, cloud platform, DIY installation. MO···