i am giving this review after 4 months of usage1 battery backup you can get battery of minimum 18 to 19 hours 2 build quality build quality of this speaker is amazing even it is rated waterproof by the company rating 553 sound quality sound quality is amazing for the price you be surprised to get this sound this price highs mids and lows all are good with this speaker rating 554 connectivity connectivity is good with bluetooth no issues in connection with blu