Features： 1、Will not produce noise and vibration when driving, softness and comfortable feeling. 2、Reduce controller temperature rise, increase vehicle continuous travel mileage. 3、More stable, higher efficient, lower current consumption, longer life. 4、KT LCD4 display screen used for KT series controller, just suitable for KT series controller, does not apply to other controller. 5、Made of high quality aluminium alloy and plastic material, sturdy, durable and long service life. Specification： Item Type: Electric Bicycle Brushless Controller Material: Aluminum Alloy + Plastic Color: As Pictures Shown KT LCD4 Display Screen Used for KT Series Controller, Just Suitable for KT Series Controller, Does Not Apply to Other Controller Controller Parameter:  Controller Box Size: Approx. 17.3x8.2x4.2cm/6.81x3.23x1.65inch Maximum Current: 30±2A Speed Set: 1-4.2V Rated Current: 15A Brake Input: Low-Level Low Volttage Protection: DC30/40±0.5v KT LCD4 Display Screen Parameter:  Size: Approx. 6.5x2.5x4.3cm/2.56x0.98x1.69inch Cable Length: 160cm/62.99inch Used for Connector 2. Smart electric quantity：True reflect battery electric quantity，real time record electric quantity consumption，insure running mileage； 3. Stall setting：Multiple gears switch and assist gear automatic power saving，shutdown state can reset when the shutdown occurs； 5. Data view：User can view the history and clear the drive data，view single or cumulative travel time，running mileage，maximum and average Speed of single trip；  6. Vehicle boosting：Has 6KM/h electric assist function，assist sign flashes when assist，cyclists can use it while driving car，makes vehicle easy and labor-saving；  7. Cruising Speed and constant Speed：Through cruising configuration and display，can maintain the Speed automatically，allows vehicle to travel at constant Speed； 8. Night driving：With backlit LCD display and headlamp switch control function， can turn on the backlight of the gauges and headlights when driving at night； 9. Password setting：Has three power-on password settings； 10. Automatic warning：In the event of a vehicle failure, you can request a different fault coding，to facilitate vehicle inspection and maintenance。With temperature display function, used for motor operation, and can realize overtemperature alarm and motor protection；  11. Use five digital communication lines，instrument has good compatibility and interchangeability，different instruments can modify the data and copy the parameters directly;  12. The main engine part and the instrument operation button adopt the substructure designed to make the operation more reasonable and convenient。  The electric bicycle controller not suitable for the scooter. Package List： 1 x Controller 1 x Meter 1 x Manual