Grafton Tools Non-contact Electrical Voltage Tester AC Detector Pen, Lifetime Replacement TRUST - Our voltage checker is backed by our LIFETIME REPLACEMENT GUARANTEE: your satisfaction or your money back! You won't get that with the bigger brands. SAFETY - Be sure you flipped the right breaker. Safety is priority #1 around electricity. EFFECTIVE - Lightweight probe detects AC voltage in outlets, wires, switchplates, and panels with flashing light and sound alert. QUALITY - On/off button with auto shutoff will protect battery life and prevent false alerts. 2 AAA batteries included. CONVENIENT - Current detector is light, compact stick/pen style, with pocket clip, similar to leading brands. Great stocking stuffer idea for Dad / great gift for any DIYer!