Function: battery indicator; headlight control; boost function; ; speed display; subtotal mileage; total mileage; running time; metric-imperial conversion; fault prompt Communication: UART Applicable Holder size: 22.2mm/25.4mm/28.6mm/31.8mm Voltage: 24V/36V/48V/60V USB charging: 5V/500mA Waterproof grade:IP67 This version is a Bluetooth version meter, which supports connecting to a mobile phone! Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Specification:SM5+2PIN Colour:Black Material:Plastic Size:71.3mmx116.1mmx22.8mm Package Contents: 1 * LCD Display Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.