To change the battery, you would slide the pocket clip up to open the end where the battery goes. It would use one AAA battery. See the product manual that is listed on our web for instructions.
Sperry Non-Contact Voltage Tester, Model# VD6509

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- Adjustable sensitivity dial able to detect the presence of AC Voltage from as low as 12V to up to 1000V AC
- 250-lb. crush-rated impact resistant ABS housing
- Patented battery self-test feature
- Built-in flashlight
- Audible and visual indicators
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