I had purchased zook rocker M2 from croma for Rs. 1000 below is my detailed review of this speaker.
Sound Output: The sound output of this speaker is very bad. It get distorted when playing music at high level. And the bass is also not that loud
Features: There are forward, backward and one on/off button. There is aux input, pen drive and SD card slot and charging port. All these are on the top of the speaker.
Build Quality: Zook does not used a good quality plastic to create the speaker and it will break down once fallen on a hard surface.
Overall if you does not need a high power bluetooth speaker without thinking of the sound quality then you can go for this and on the other hand if you are avid listner of music then don’t go for this speaker.