Features BRIGHT LIGHTS: Flashing lights make work easier, remain visible in sunlight, and last longer than regular bulbs INTELLIGENT CONTROL: Built in intelligent motherboard chip, professional upgrade chip control program, safe electricity, starting from the core PORTABLE PEN HOLDER: Come with humanized pen holder design, easy for electrical maintenance and carry FOR CIRCUIT: Maintenance electrical test, screwdriver assist, add sound and light alarm function LIVE NEUTRAL WIRE IDENTIFICATION: Compact size, stable and reliable, waterproof and fall resistant, insulation and no leakage Specification: Item Type: Electrical Tester Pen Material: ABS Measuring Range: 24-250V LED Lamp Bead: Highlight LED lamp bead Bit Exposed Length: Approx. 16.5mm / 0.65in Bit Exposed Width: Approx. 3.5mm / 0.14in Battery Model: 3 x LR41 Button battery Capacity: 40mAh(capacity of a single battery) Package List:5 x Electrical Tester Pen Package List 5 x Electrical Tester Pen