Aluratek iStream Universal Bluetooth Audio Receiver: Easily add Bluetooth capability to your existing stereo system or speaker dock using this receiver, which lets you wirelessly stream audio from your Bluetooth-enabled device from up to 33 feet away. Built-in battery provides up to 12 hours of wireless use.
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I honestly thought it would be a big box but i was ver surprised to get a box about 2in square. I finally got the 3.5mm adapter to be able to use it in my truck today and works great, sound is just the same as if i hooked up my phone directly to the aux cable in my truck.