A handy bivvy lamp that can also be used to charge your portable devices 9900mAh lithium battery rechargeable via USB port Three brightness levels: High (400 lumens), Medium (150 lumens) and Low (15 lumens) Supplied with a hooking carabiner Characterised by a magnetic base Autonomy: 12 hours in "High" mode Supplied with USB cable for charging Dimensions: 65mm x 65mm x 80mm Weight: 315g Important note: recharge the batteries every 3 months in case of prolonged non-use. The battery will guarantee optimal performance after a few complete discharge and recharge cycles.