Nest Labs Nest Protect. Detector type: Combi detector, Product colour: White, Alarm decibels: 85 dB. Power source: Battery, Battery technology: Lithium, Battery voltage: 1.5 V. Width: 135 mm, Depth: 38.5 mm, Height: 135 mm. Package type: Box. Connectivity technology: Wireless, Wi-Fi standards: 802.11b,802.11g,Wi-Fi 4 (802.11n), Wi-Fi frequency: 2.4 GHz