1Manufacturing Material: The controller housing is made of high quality metal with groove design, which effectively protects the internal circuitry from thermal overload due to its excellent cooling capability. 2Multifunctional S900 Display: The S900 display has multiple functions, can be used as a driving computer and control the entire electric bicycle system after conversion. It is compatible with 36V and 48V voltages, which can truly reflect the battery power and record the power consumption in real time to ensure cycling mileage. 3Easier to View Data: The color display on the meter makes it easier to view the data on the panel. While riding the bike, the product will display a lot of useful data on your bike, such as the remaining battery, current speed, average speed, maximum speed, clock, total one way distance. 4Bicycle Lithium Modification Kit: Bicycle lithium modification kit contains 30A waterproof controller, S900 meter, 130X shifter, 8C assist sensor, brake handle, 1 to 5 connecting line and taillight combination kit, suitable for 36V, 48V, 1000W motor bicycle lithium modification. 5Simple Operation: Simple to operate, easy to use, easy to install and disassemble. Without any difficult requirements even though you use it for the first time. 6Meter Function: Display functions includes speed display, assist sensor gear display, power indicator, fault hint, total mileage, single mileage, headlight display, single driving time display. Control and setting functions includes power switch control, headlight switch control, 6km/h inching control, wheel diameter setting, maximum speed setting, idle automatic sleep time setting, back light brightness setting, voltage level setting, power assist sensor connection. Item Type:ElectricBikeControllerKit Weight: Approx.1288g / 45.4oz Material: Aluminum Alloy + Plastic Product Size:Controller Box Size: Approx.150 x 83 x 42mm / 5.9 x 3.3 x 1.7inMeter Size: Approx.11 x 6cm / 0.4 x 0.2inConnector Type: Waterproof Connector Rated Voltage Of The Controller: 36V DC, 48V DC Maximum Current Of Controller: 30A Controller Speed Setting: 1-4.2V Controller Brake Input: Low Level Booster: 1:5 Applicable Motor Power: 1000W 1 x Controller 1 x S900 Meter 2 x Meter Washer 1 x Shifter Accelerator 1 x 8C Assist Sensor2 x Brake Handle 1 x 1 to 5 Connecting Wire 1 x Light Wire 1 x Tail Light 1 x Controller Wiring Manual 1. Use the product that complies with the communication protocol.2. Please allow 01 inch error due to manual measurement. Thanks for your understanding.