Features: With touch-screen design, easy for operation. It can mount on the rear view of the mirror. The red connects to positive and black connects to negative. 3 standard for your option: Voltmeter /Temperature & Voltage/Temperature+ Voltage+Time+Stopwatch. LED Display, perfect to monitor the conditions of the battery, you can use it on your motorcycles. Specifications: Material: PC Length: approx 5.1cm/2-inch Type: voltage gauge/temperature & voltage/4 in 1(optional) Color: red/white/blue/green Package Includes: 1x Digital Voltmeter Or 1x Temperature & Voltage Meter Or 1x 4 in 1 Meter note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.