Upgraded version - Bluetooth Speakers TaoTronics Wireless Speaker Portable Speaker (Bluetooth 4.0, High Fidelity Audio, Built-in Microphone, LED Light, A2DP Profiling, 6 Hours Playtime)-White

Great speaker for the price

I tested this speaker with my One Plus smartphone and Macbook pro laptop via bluetooth and AUX cable for about a week. The speaker also has a small embedded mic. I also used it for voice calling and it worked perfectly without any issues. I would give it 4.5/5. Its pretty loud for its size and connects flawlessly with light indicators. I got 6 working hrs for a full charge.

Its not the best and loud sound quality. Its definitely louder than smartphones, laptops and computers so I can compare the sound quality to computer speakers

Pros
1. Cheap ($15 when I bought it)
2. Connected to all my devices without any issues (Bluetooth 4.0)
3. Volume control
4. Hands-free calling with the built-in microphone 
5. Useful light indicator/connection sounds
6. Aux Input
7. Lightweight and extremely portable. Tiny can fit in the palm of your hand
8. Track changing buttons
9. 12 month warranty and a 30 day money back guaranty

Cons
1. Could not connect two devices as advertised
2. Not the best sound quality. 

Amazon link: http://amzn.com/B015SOSPLI