You can pay up to $200 for speakers to hook to your cell phone or tablet—I haven’t tried those, but I suspect you get what you pay for.
The music sound when iPhone put on top is not so clear, but it works. When I play an e-book, the voice doesn’t sound right. When plugged in with audio jack (not included) the sound is much better, but not great. For the price, though, it is not bad. With or without the audio cable, when playing at the loudest volume levels some distortion occurs.
It uses three AA batteries (not provided). It didn’t work with my AA rechargeable batteries. A micro USB socket is provided to give external power (doesn’t drain the three batteries), but no cable is included.
Instruction pamphlet says 3 alkaline batteries will last 6 months in standby mode, but no indication of how long the batteries will last when playing the device.
It doesn’t use Bluetooth to connect the audio to your mobile device, which puts less strain on your mobile device’s batteries.
It doesn’t cost very much (compared to $100+ devices).
As for the sound when replaying music, you get what you pay for. It’s OK.
Neither an audio cable, batteries, a micro USB cable (for external power), nor an external power supply is included.
It wouldn’t work with my rechargeable batteries.