Specifications:
Automatic switch 
Working time: 5 hours
Low power alert
3.5mm audio input
DC 5V USB input
Output Power:2W*2
Batteries:AA*3 or DC 5V /500mA 
Product size:130x47x69mm

Features:

• Magically amplifies the sound from-iphone etc.
• No configuration such as paring is needed.
• Automatically turns on and off.
• Supported by most IOS devices and Android phone (Speaker must be at the bottom of the phone)
• Powerful output of 2W×2RMS
• Battery low indication