Nedis SmartLife. Product colour: White, Alarm decibels: 85 dB, Mounting type: Surface-mounted. Power source: Battery, Input voltage: 3 V, Compatible battery sizes: CR123A. Width: 76 mm, Depth: 76 mm, Height: 28.5 mm. Quantity per pack: 3 pc(s), Package width: 105 mm, Package depth: 105 mm. Connectivity technology: Wireless, Wi-Fi frequency: 2.4 GHz