Length: 13.4 cm (5.3 in) · Width: 1.6 in (3.95 cm) · Height: 13.4 cm (5.3 in)

Nest Protect Battery: 379.0 g (13.9 oz) · Nest Protect Wired: 375.0 g (13.2 oz)

White

Split‑spectrum smoke sensor · Electrochemical carbon monoxide sensor (Nest Protect's sensor lasts up to 10 years from the date of manufacture.) · Temperature · Humidity · Occupancy (120° field of view up to 6 m [20 ft]) · Ambient light · Accelerometer

Six long-life AA batteries · Battery model: Six long-life AA batteries (Energizer® Ultimate Lithium “L91”) · Wired model: Three long-life backup AA batteries (Energizer® Ultimate Lithium “L91”)

802.11b/g/n (2.4GHz) Wi-Fi · 802.15.4 (2.4 GHz) · Bluetooth Low Energy

40ºF (4ºC) to 100ºF (38ºC) · The alarm should not be installed in locations where the normal ambient temperature is below 4 °C (40 °F) or exceeds 38 °C (100 °F). Humidity range: 20% RH to 80% RH (non condensing).

80 dB @ 3 ft (1 m) @ 1kHz · Speaker loudness: 80 dB @ 1 m (3 ft) @ 1kHz · Horn · 85 dB SPL @ 3 m (10 ft)

Two-year limited warranty · Two-year limited warranty. For help, visit nest.com/support.

Complies with safety standards set out by UL · The 2nd generation Nest Protect has been tested by UL to comply with Australian, European, US and Canadian safety standards. Nest Protect complies with all of the following smoke and carbon monoxide alarm standards.

RGB colour ring with 6 LEDs

Nest Protect: 2nd Gen Smoke + CO Alarm · Backplate · Four screws · User guide · Welcome Guide · Six long-life AA batteries (Battery model) · Three long-life backup AA batteries (Wired model) · 120 V AC connector (Wired model) · Three wire nuts (Wired model)

Wi-Fi connection. · Phone or tablet with iOS 8 or later, or Android 4 or later · Free Nest account.