Note: Manual measurement, please allow 0.4?0.7in error. Specification: Item Type: Cassette Adapter_x000D_Material: ABS_x000D_Tape Size: Approx. 10 x 6.4 x 1cm / 3.9 x 2.5 x 0.4in_x000D_Color: Black_x000D_Battery: Lithium Battery Capacity: 300mAh_x000D_Bluetooth: 5.0_x000D_Parameter:_x000D_Support Any Mobile Phone, Tablet, Car Speaker or Other Devices Equipped with Standard Bluetooth Technology_x000D_Ideal for Home or Car Speaker System_x000D_High Fidelity Sound, Long Playing Time, Stable and fast Transmission, No Cable, Simple Features: 1[Multifunction] With this tape adapter, you can answer calls or control music on the receiver, change the volume, play, pause, skip music, and have a long playing time. 2[Compatible] The cassette adapter supports any mobile phone, tablet, MP3 player, car stereo, headset or other devices equipped with standard bluetooth technology. 3[Stereo] Smart design creates a safe connection, double shielding, polished metal and corrosion resistant gold plated plugs, high fidelity, seamless transmission of stereo sound. 4[Good Performance] Every small component of the tape aux receiver has been tested thousands of times, intelligent noise reduction, to ensure reliable performance and minimum signal loss. 5[Easy To Use] This cassette adapter allows you to continue to enjoy the music on your phone without changing or modifying your car, it is simple without cables, with stable and fast transmission. PackageList: 1 xCassette Adapter 1 xUSB Power Supply Cable