Features: Power indication: the detector shows that red indicates that the power is exhausted yellow indicates that the power is too low and green indicates that the power is sufficient. Support a variety of models: this detector has multiple functions which can quickly identify the positive and negative electrodes n-type-batteries 1.5V batteries. Material: this detector adopts ABS insulated plastic shell which is light small and convenient to use. Easy to Use: Just take out the tester and use it in your work a very convenient tool for you. Rust Proof: This tester adopts high quality material which will avoid rust well. Note:Cannot measure-the-rechargeable-battery. Speciifiications: Material: ABS Plastic Measuring Range:1.5V(AA/AAA)dry-battery 1.5V(button-battery cannot check 3V batteries) 9V 6F22 batteries Function: Battery-tester includes: 1 * Tester "