installed in a 10 year old Seat, zus. yet Alpine amplifier and subwoofer (Quadral) connected. Optically a gem, super sound output level and high-pass / low-pass adjustable. Phone with Bluetooth works perfectly, even address can be operated! Even the micro to acquit works well, no noise, you have something to experiment with placement, must not be too far away. The choice of music from USB works well, no complaints. Round for the price a great device