Budget 300 or less, you can consider the Sony Ericsson SA-F67, high-power subwoofer with wireless microphone amplifier, support for USB and TF card playback, but also through the cell phone Bluetooth transmission, very stable.
Soai's outdoor speakers are in fact famous, square dance mom group of net red products, mainly speakers are large enough, the sound spread far enough, there is a remote control, do not need the whole phone operation, 3600mAh battery, every night exercise 2 hours, a week without charging is also proper.
Height of about 40cm, usually placed in the home does not occupy space. A lot of shopping malls are also using Sony Ericsson's speakers, so you can imagine that it is really good.