Lumsing&reg; Portable Wireless Bluetooth Speaker with NFC Built-in Microphone, Powerful Sound Rechargeable Battery up to 1 Day Playtime
Bought this on sale, so for the price, size, and weight the sound and functionality is very good.  Main complaint is really that when in Bluetooth mode, it's hard to tell what's going on when the + and - buttons are pressed -- a long press will adjust volume, while a short press will change tracks. However, this means it's hard to make small volume adjustments since you have to hold onto the button but there's no way to tell how much the volume has gone up, until it actually does (quite quickly).  The Chine