AUTUT Automotive Speaker Polarity Tester Phasemeter Tool Plastic Shell Audio Signals Tester
<b>Product Specification</b><br>Material: Plastic <br>Color: Black <br>Dimension (L*W*H): 10.5 x 7 x 2.5cm/ 4.1 x 2.8 x 1.0 inches<br>Powered By: 1 x 9V 6F22 Battery (not included) <br>Package Content: 1 x PH Phase Meter + 1 x CD<br><br><b>There are 4 section test music in the CD.</b><br>Section 1: left channel noise signal <br>Section 2: right channel noise signal <br>Section 3: phase test signal <br>Section 4: same as section 3<br><br><b>How to use the tester?</b><br>Put it in car cd player, and play section 1 or 2, check if left/right channel connection is right. <br>Play section 3 or 4, the sound speaker will produce a fixed frequency signal, then press 'test' button. <br>3 green light flash and 1 red light indicates that the speaker output is in positive phase (correct connection).<br>3 red light flash and 1 green light indicates negative phase (reversed connection).<br><br><b>Warm Tips</b><br>All of our product are Fulfilled by Amazon ensures accurate and fast delivery.<br>If you have any problems about usage or any defective issues, please feel free to contact us. We will try out best to make things right.