FM Stereo Transmitter, SONY TMR-FM7, 3.5mm jack connection. - Brand: SONY - Model Name: TMR-FM7 - Type: FM Stereo Transmitter - Connection Terminals: 3.5mm jack - Power: ON/OFF switch I bought this a long time ago and I'm not sure if I ever used it. The lamp lights up when I turn it on with batteries, but I haven't confirmed its operation. Please understand the above. Please check the condition in the photos. I will wrap it in bubble wrap and ship it via post. Thank you for looking.