Features: This car automotiverelay tester is a must-have tool for any car owner or mechanic, with its ability to detect 4 pin/5pin automotiverelays and work with 12/24v voltage. With 2 large capacity 18650 modebatteries(Not included), this portable test equipment can be used continuously without the need for an external power supply, making it perfect for on-thegos repairs. Suitable for driver, mechanic, and anyone who wants to take control of their car maintenance, this automotiverelay tester is easy to use, providing accurate measurements and quickresults. Whether you're in-the garage or on the road, this circuit tester is small and easy to carry, making it idealfor being placed in briefcases or satchels forquick access to diagnose any carissues. Made of high-quality abs material, this car relays tester is durable and reliable, ensuring that you'll have a useful and long-lasting tool in your for all of your automotive needs. Specifications: Material:Plastic Size:Approx.9.7x2.7x20cm/3.81x1.06x7.87inch Color:Black Working temperature: -20~+50 Battery:2x18650 batteries (Not included) 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: 1x Car Battery Checker