The Konnwei Bluetooth Battery Tester BK100 is a must-have device for anyone who wants to stay on top of their car battery's performance. This tester is compatible with 6v/12v gel battery's and can detect the battery's status with ease. With the ability to analyze battery voltage and cold cranking amp, you can be sure that your battery is performing at its best. The best part? You can use this tester with any mobile phone via Bluetooth. Don't let a dead battery catch you off guard - get the Konnwei Bluetooth Battery Tester BK100 today