_x000D_ Easy to install, perfect match with the car_x000D_ Allows the addition of 2 or 4-channel amplifiers to most stereo systems without RCA output-allows the addition of amplifiers and subwoofers to existing factory systems_x000D_ The device has a built-in relay. When your stereo sends sound to the speakers, this device converts the speaker signal to the amplifier's RCA jack, and at the same time, it will provide you with the voltage required to turn on the amplifier with 12 volts from the amplifier's power supply end._x000D_ High-level speaker signal to low-level RCA adapter_x000D_ _x000D_ specification:_x000D_ Applicable models:_x000D_ Suitable for most models on the market_x000D_ Colour:Gray_x000D_ Material:ABS_x000D_ Size:5.5x3.5x3cm_x000D_ _x000D_ Package Contents:_x000D_ 1* Audio converter_x000D_ _x000D_ Only the above package content, other products are not included._x000D_ Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm._x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_