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 or 25.4mm or 28.6mm or 31.8mm Voltage: 24V or 36V or 48V or 60V USB charging: 5V or 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:SM5PIN Colour:Black Material:Plastic Size:71.3mmx116.1mmx22.8mm Package Contents: 1 x 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.