$2.98 + $4.49 shipping = $7.47 @ ShopCell through AmazonWorks with MP3 player that has a 1/8 (3.5mm) headphone jack.
Includes a USB port for charging your device while you listen. * Compatible with all MP3 players
* Uses built-in, USB-rechargeable Lithium-Ion battery for hours of play
* Three user-programmable presets save the best frequencies for quick access later
* User-selectable stereo or mono output lets you tailor playback to the recording
* Qui...