XtremeMac Airplay2 FM Transmitter for iPod

Manufactured by: XtremeMac
Average cost: $49.95
Compatible with: Dock Connector iPods 4th Gen or later
Colours: black, whaite
Description: It's as thin and narrow as the iPod nano and features three programmable station presets that allow you to conveniently recall your clearest transmission frequencies.
Features:

Play iPod on a car stereo or any FM radio
Uses any FM frequency from 88.1 to 107.9
Three programmable station presets for convenient recall of clearest frequencies
Pass-through Dock Connector functionality
Fits all Video iPod, iPod nano, 4th gen iPod, iPod photo and iPod mini
Incredibly simple and quick to setup
High fidelity, full stereo quality