The GoGroove FlexSmart X2 Bluetooth car FM transmitter and USB charger is down to $15.99 through Woot. The same transmitter goes for around $30 at Walmart and other retailers.

Use your Amazon Prime account to avoid Woot's mandatory shipping fee.

Use the GoGroove to listen to your smartphone's audio through your car speakers. The on-board controls include easy access to the volume, Bluetooth pairing, and buttons for receiving calls. It can pair two Bluetooth devices simultaneously, which is great if you have a couple of car DJs on the road with you. The built-in mic has enhanced voice detection, and the USB charging port lets you keep your device powered up while you're streaming music.

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