Features1Delivery: The bicycle lithium battery retrofit controller kit includes a 17A controller; M3 instrument, accelerator dial; Boost sensor wiring; Boost sensor booster pad, front lamp, tail lamp, brake handle, etc. Suitable for DIY modification and meet all needs. 2Metal Controller Shell: The controller shell is made of metal with groove design. Due to its good heat dissipation function, it can protect the internal circuit to avoid thermal overload. 3ABS Meter: The meter is made of ABS material, which is light, durable, fine and has good toughness and waterproof performance, providing better protection for the internal circuit and making it more durable. 4Multiple Functions: When riding a bike, the product will display many useful data on your bike, such as switch buttons, light switches, battery power display and other functions. A display screen can let you keep track of the situation. 5Applicable: 17A controller kit is applicable to 250W to 350W gear motor; Main applications: DIY electric bicycle, electric scooter, folding bike, etc; It is easy to maintain. The lithium battery modification of bicycles greatly improves the fun of riding, and is suitable for cyclists who like challenges.SpecificationItem Type: Electric Bicycle Conversion KitMaterial: ABS, rubber, aluminum alloy, metalGross Weight: 1184g/41.8ozApplicable: 250W to 350W gear motorController Size: 90x50x30mm/3.5x2x1.2inController Current: 17AController Voltage: DC 36V 48VController Speed Setting: 1.1-4.2VBraking: Input low levelPackage List1 x M3 Meter1 x Controller1 x Boost Sensor Wiring1 x Boost Sensor Boost Pad1 x Throttle Dial1 x Wire1 x Front Lamp1 x Tail Light2 x Brake Handle1 x Main Control Switch1 x Instructions