Sonos Roam Wireless Charger Specifications: Magnets in the charging pad quickly attach to Roam Custom-designed to feel like an extension of the speaker Can be used while Roam is oriented vertically or horizontally Rated IP54 (resistant to dust and liquid splashes) Charges Roam from 0% to 50% in two hours Power supply input: 5 VDC, 2.1A (10.2 W) Power supply output: 5 W Operating temperature: 32°F to 104°F (0°C to 40°C) Cable length: 3.9 ft (1.2 m) Weight: 0.26 lb (0.12 kg)