1. The product is small, one-handed operation, not tired of holding for a long time 2. With component judgment lights, lighted components normal, not lighted components failure or poor contact 3. All-in-one type component testing device, one-step identification, intelligent identification of the results in seconds, efficient, fast, accurate and stable 4. The use of copper components test port, to avoid frequent insertion and removal of accelerated damage, effective test circuitry 5. Elastic plum type telescopic probe, 4 independent needle telescopic Type-c port plugging use, need external power supply, low power consumption, long-lasting and durable. (Type-c Power cord not included) Name: Optocoupler test tool Product Model: TO1 Input interface: Type-c Input voltage: 5V Input current: 0.2A LED power-on indicator: when charging, red light flashing / full, red light always on LED component judgment light: light indicates that the components are normal, does not light indicates component failure or poor contact Applicable test object: only support optocoupler test Color: Black Material: plastic Package Contents: 1 * Optocoupler Tester