1. The product is compact and can be operated with one hand, making it easy to hold for a long time without feeling tired 2. With component judgment light, if it lights up, it indicates that the component is normal, and if it doesn't light up, it indicates that the component is faulty or has poor contact 3. Integrated model component testing tool, one-step recognition, intelligent recognition results in seconds, efficient, fast, accurate, and stable 4. Use copper component test ports to avoid frequent insertion and extraction, accelerate damage, and effectively test circuits 5. Elastic plum blossom shaped telescopic probe, 4-pin independent telescopic probe Get rid of the wired system, type-c port can be used for both charging and plugging, without the need for an external power supply, with long battery life, low power consumption, and long-lasting durability.(Type-c Power cord not included). Name: Optocoupler test tool Specifications: charging version (built-in polymer lithium-ion battery) Input interface: type-c Input voltage: 5v Input current: 0.2a Led power on indicator light: when charging, the red light flashes/when fully charged, the red light stays on Led component judgment light: if it lights up, it indicates that the component is normal; if it doesn't light up, it indicates a component malfunction or poor contact Applicable test object: Only supports optocoupler testing Color: Black Material: plastic Package Contents: 1 * Optocoupler Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.