Features: Made of high qualified material, it is solid and durable. Check the relay contact function properly. Watch the pin configuration, the-time to contacts closure and opening, consistency of the relay. If the relay is abnormal the red LED will light, it is normal the green LED will light. Provides a convenient and intuitive-diagnostic way, time-saving and economical. Small size, compact-structure, easy to carry, you can test anywhere as you want. Specifications: Material:Plastic Size:Approx.13x3x7cm/5.11x1.18x2.75inch Color: Black & Red Five High Advantages 1.Safety and environmental protection 2.Good durability 3.Cost-effective 4.Strong temperature resistance 5.Lightweight and generous Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1 Set Car Battery Checker Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia