1. 6 in 1 Current Test Cable with battery charging activation plates, are used to find the phone problems by checking the phone working current in charging. 2. Easy to use: Just snap the activation plate onto the corresponding battery, and plug into the power of positive and negative interfaces with the Red/Black power cord. 3. Note: Recommend for professional maintenance personnel to use ONLY. The plate will disconnect the circuit automatically when it detected overload current. Please pay attention to the power supply when testing. 4. Compatible with: iPhone XS Max / XR / X / 8 / 7 / 6 / 6s Plus / 5 / 5C / 5S / 4S