433993 Weight: 250g Dimensions: 9.84 in x 9.65 in x 2.36 in (25 cm x 24.5 cm x 6 cm) Brand：BIKEMAN Model：YKGJ-B0012 Quantity：1 Color：Dark 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: 3.7V， 850mAh lithium battery(Can charge on DC5V500mA adapter) Best Use: Mountain Cycling ， Road Cycling ， Bike commuting & touring 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