AT-FMT6FM Stereo Transmitter Input Terminal: φ3.5 Stereo Mini Plug Input Impedance: 10kΩ Transmission Frequency: 88.1MHz～89.9MHz, 0.1MHz steps, 19 channels Cord Length: 13cm Maximum External Dimensions: Approximately H60 x W60 x D26mm Uses 4 AAA batteries! (Batteries not included due to shipping restrictions) Power has been confirmed, but functionality has not been tested in a car, so please consider this a junk item. The item has been stored at home for a long time and has discolored overall due to sun exposure. We firmly decline purchases from those seeking perfection or those who are critical in their evaluations. The item will be wrapped in bubble wrap and shipped via Yu-Packet Post Mini.