433988 Weight: 128g Dimensions: 7.68 in x 7.09 in x 1.57 in (19.5 cm x 18 cm x 4 cm) Brand：BIKEMAN Model：YKMN-B0002 Quantity：1 Color：Gray + Black Material: Nylon + Oxford Shell Material: PC + ABS Communication Mode：Wireless Frequency 2.4GHZ Control Distance: 3m Backpack/Pendant: Waterproof Fabric Working Time: 20-30H Charging Time：3H（With LED Indicator Light） Remote Controller Battery: 2 x CR2032(Built-in) Remote Controller Waterproof Level：IPX-5 Receiver Waterproof Level：IPX-2 Receiver Battery: 4.2V， 650mAh lithium battery(Can charge on DC5V500mA adapter) Best Use: Mountain Cycling ， Road Cycling ， Bike commuting & touring Notice: Can not be sold in Britain， Germany and Canada， because they have agented for this brand Packing List: 1 x Signal Lamp Vest 1 x Remote Controller 1 x Remote Controller Deck 1 x USB Cable (50 cm) 1 x Chinese Manual 4 x Handlebar Binding Wire