1. Reduces FM 88-108MHz to 76-90MHz (All Channel Antenna), designed for lower frequency car audio reception. 2. Enhances car audio performance by expanding frequency reception range. 3. Reliable quality and safety; each unit is individually tuned to the desired band using appropriate RF test equipment. 4. Features a red wire for positive terminal and black wire for negative terminal, facilitating easy installation. 5. Compatible with most Japanese car radios, including brands such as Sony, Clarion, Kenwood, Alpine, and Panasonic. Frequency Range: 76-90MHz (converted from FM 88-108MHz) Hole Diameter: 1.2cm / 0.47inch Dimensions (W x H): 2.5 x 1.9cm / 0.98inch x 0.75inch Total Length: 30.5cm / 12inch Color: Black Material: ABS Package Contents: 1 x Car FM Band Expander 1 x Instruction Manual Note: Light shooting and different displays may cause the color of the item in the picture to vary slightly from the actual product. Measurement may vary by +/- 1-3cm.