Features Bright LED Lights: Enjoy enhanced visibility with flashing lights that perform well in direct sunlight and offer a longer lifespan than standard bulbs Intelligent Control System: Equipped with a professional-grade motherboard chip for improved safety and efficiency, ensuring reliable performance during electrical testing Convenient Pen Holder Design: Easily carry and store your tool with the user-friendly pen holder, making electrical maintenance tasks more manageable Multi-Functional Testing Capabilities: Perform electrical circuit tests with added sound and light alarms for quick troubleshooting and accurate diagnostics Live Wire Identification: Compact, waterproof, and fall-resistant design ensures stable performance for safely identifying live and neutral wires without leakage Features: 1、BRIGHT LIGHTS: Flashing lights make work easier, remain visible in sunlight, and last longer than regular bulbs 2、INTELLIGENT CONTROL: Built in intelligent motherboard chip, profional upgrade chip control program, safe electricity, starting from the core 3、PORTABLE PEN HOLDER: Come with humanized pen holder design, easy for electrical maintenance and carry 4、FOR CIRCUIT: Maintenance electrical test, screwdriver assist, add sound and light alarm function 5、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