Weight: Nest Guard weight: 9 oz without cable (256 g);Nest Detect weight: 1.26 oz (36 g);Open-close magnet weight:0.35 oz (10 g);Nest Tag weight: 0.17 oz (5 g);Nest Guard: Diameter: 3.7 in (9.5 cm), Height: 2.1 in (5.3 cm), Cable length: 6 ft (2 m);Nest Detect: Height: 3.2 in (80.5 mm), Width: 0.8 in (20.4 mm), Depth: 0.9 in (22.2 mm);Open/close magnet: Height: 1.3 in (33.8 mm), Width: 0.4 in (10.3 mm), Depth: 0.4 in (11 mm);Nest Tag: Diameter: 1.46 in (37 mm), Thickness: 0.28 in (7 mm); Nest Detect requires 1 CR123 (included);Average battery life: 2-year battery life for Nest Detect;Color: White; Certification: Nest Guard and Nest Detect are UL certified;Warranty: Comes with a 2-year limited warranty;Requires a compatible phone or tablet with the free Nest app and Bluetooth 4.0;Nest Guard requires an indoor outlet and Wi-Fi connection with internet access;Nest Tag and Nest Detect require Nest Guard.