1. Flexible and easy to use.Perfect match with the Car 2. and nice qulity, durable to use. 3. Built to strict quality control standards.Not easy to damage, long service life 4. Stable performance, high reliability.a perfect replacement for your old ones 5. Made of high quality material, for durable use. Item Type:Active Radio Antenna with Bluetooth Modulator Antenna gain:15DBI Working voltage:12V Standing wave ratio:Less than 2.5 Antenna connector:Lantern connector (FM) Antenna cable length:5M Applicable type: Universal car roof antenna 1: Place the antenna modulator behind the car stereo, such as a suitable location behind the DVD or radio 2: Connect the FM male end of this antenna to the sound hole of the for original-car CD or DVD. 3: After the phone is powered on, turn on Bluetooth and connect to the device name of the radio antenna:KROWN-6965 4: After power on, the red power light stays on, the blue signal light flashes, and after the Bluetooth connection is successful, the blue light stays on. 5: Convert mobile phone Bluetooth music into RF signals. There are five LEDs that respectively represent 10 different frequency points. The red lights are on. There are two groups of 5 LEDs each. The default group is always on, and the backup group flashes when the frequency point is last confirmed by the customer. It has a power-off memory function. The last frequency point will be retained when powered on later. Condition: Colour:Black Material:ABS Package Contents: 1 * Active Radio Antenna with Bluetooth Modulator Only the above package content, other products are not included. Note: Light reflection 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.