Ruggedness and waterproof design: We give precedence to speakers that are built to outlive the knocks and bumps of travel. We like speakers with an Ingress Defense (IP) score, which tells you exactly how dustproof and waterproof a speaker is. If your speaker is bigger than the size Restrict, https://www.bluetoothspeaker.top/boombox-best-bluetooth-speaker-for-outdoor-waterproof-wireless-speakers/