The RiverFi portable bluetooth speaker is a compact rechargeable portable speaker that is equipped with a 2600Ah battery bank, allowing you to enjoy hours of play time and even charge your smart device if it happens to die so you are never without music again. Additionally, this speaker allows for bluetooth streaming or for you to play your music using the Micro SD card slot. Furthermore, this optimized speakers offers high fidelity sound, a range of up to 33 feet and? a 30 mm driver. The RiverFi receives 4.2 out of 5 stars on Amazon, with users claiming it is a good product for long car rides and has a really great design. However, a handful of users wish the sound was louder.