Specification Why you should chose this item? 1. Intelligent identification: support and automatic identification (no need to select) 12V/24V relay, inserted to test. (Most of the market can only test 12V) 2. Wide range of relay compatibility: support for 5 different foot type of relay, more than 20 kinds of relays (the same market more than 4 foot or 3 foot) 3. This tester could test relay condition,whether relay on or off. (Market products do not have this function, you need to judge by your experience through the relay internal line type) 4. Battery power supply: 3 section 5 batteries (3pcs * AA battery) without linking the battery power supply, with the test. (Most of the market requires battery clip power supply, when using the limitations) 5. Energy efficient: automatic shutdown (no operation within 1 minute shutdown, shutdown completely without power consumption), the test process, sound and light synchronization prompts (dual-color LED indicator green, red + buzzer) 6. Intimate Prompts: low battery alarm (buzzer 5 seconds interval 2 times) + LED light prompts 7. Pin switching: 4Pin / 5pin pin switching (the same market with the same type of products) 8. Power Source: 3pcs 1.5V AA Battery, or a piece of TYPE-C cable power supply, you can use this TYPE-C cable connects with laptop,power bank etc extranal power source devices. 9. Craft material: silicone oil spraying process, more environmentally friendly, better hand feeling. Package included: 1x Relay tester 1x English manual 1x USB C cable