Features 1、Better Monitor: Able to clearly display the real time battery level, the battery meter enables better power control. 2、Practical Uses: Suits for Ni MH battery, 18650 and polymer lithium battery packs, car battery, electric equipment, etc. 3、Secure Working: With the reverse connection function, the equipment will not burn even if the terminals are reversed. 4、Great Material: Mainly made of high quality PCB material, not easy to malfunction, and very durable for long term use. 5、Easy to Install: Designed to have a light weight and a compact size as well, the installation is very convenient. Specification Item Type: Battery Meter Material: PCB Hole Diameter: Approx. 2mm / 0.08in Product Size: Approx. 45 x 20mm / 1.77 x 0.79in Thickness: Approx. 8mm / 0.31in Package List 1 x Battery Meter