IP67 is a typical ranking today indicating extremely resistant and doubtless rugged audio system appropriate for out of doors audio system. Some are small enough to clip to your backpack, while others are more at home being a centerpiece and will fill a room with wealthy, specific audio �?often https://www.bluetoothspeaker.top/original-wireless-speaker-bt-outdoor-subwoofer-hi-fi-sound-quality-waterproof-portable-speaker/