Item Type: Button Cell Battery Checker Material: ABS Function: Used to measure the remaining charge of coin cell batteries Scope of Application: Most of the button batteries Package List 1 x Button Cell Battery Checker 1 x Box 1Function: The battery tester is used to test the remaining power of the coin cell battery, which is widely used in most coin cell batteries. 2High Efficiency: The built in battery compartment drawer holds at least two coin cell batteries, makes it for easy battery level detection and higher efficiency. 3Digital LCD Display: This battery tester is equipped with an LCD screen that allows you to check the status of your battery anytime, anywhere. 4Durable Material: Made of ABS plastic material, which is impact resistant and wear proof, stable and durable, can be used for a long time. 5Portable: Lightweight and portable, the battery tester can easily fit it in your pocket for easy use at any time.