Feature:1. The phase meter can test all speakers of all cars, such as small tweeters, door speakers, subwoofers, etc.2. Effectively used to test speakers, perfect for safe troubleshooting and testing of audio systems.3. It can be used for car audio speaker test. Professional manufacturing, high reliability.4. The loudspeaker wiring specially for adjusting the car sound system, only the correct wiring, the sound can be replayed truthfully when listening to music.5. The battery type of the phase meter is lithium battery, battery model: 6F22 (delivery without battery).Specification:Item Type: Phase TesterMaterial: ABSUse: The loudspeaker wiring specially for adjusting the car sound system, only the correct wiring, the sound can be replayed truthfully when listening to music, just have the feeling of harmonious and realistic nature.Application: UniversalBattery Type: Lithium batteryBattery Model: 6F22(shipped without batteries).Package List:1 x Phase Tester1 x CD