How to Use: Plug and Play Specification: Item Type: Audio Cable Adapter Material: ABS Product Color: As Pictures Shown Fitment: Replacement for Alpine Ai‑net Replacement for JVC KS-U58 PD100 U57 U29 KCA-121B interface cable dedicated for Ai-NET/RCA opening method: Such as the 2004 and 2003 parts factory after having for AI-Net interface hosts can install CDA-7894, CDA-7893, CDA-7809, CDA-9805, CDA-9807, CDA-9811, CDA-9812, CDA-9813, CDA- 9815, CDA-9827, CDA-9857,CDA-9830, CDA-9831, CDA-9833, CDA-9835, CDA-7998, CVA-1004, IVA-D300, IVA-D900, INA-N333 CDA-9805, CDA-9807 Auxiliary mode setting (V-Link): 1. Press and hold the "Power/Initialize" button for 3 seconds or more, 2. Press DN or up to select "AUX". 3. Press the play/pause button to operate in the "auxiliary input on" and "auxiliary input off" modes. 4. In this way, you can use the disc box interface as auxiliary input, and you can also use special cables to connect KCA-121B, KCA-420I to connect CDA-7894, CDA-7893, CDA-7809, CDA-9811, CDA-9813, CDA-9815, CDA-9827, etc. Host setting method: auxiliary mode setting (V-Link) Package List: 1 x Audio Cable Adapter