Model name Smart Smoke Alarm Kit (With Hub) | Wireless Frequency Range 2.4GHz | Included Accessories 2 × Expansion Screw1 × User Manual2 × 1.5V AA Battery1 × Power Adapter1 × USB Cable1 × Smart Hub1 × CE DOC | Dimensions Alarm: φ120 × 36.7 mm ; Hub: 59 × 41 × 21 mm | Unit Net Weight 0.305 kg