The EcoBoulder Max Bluetooth Speaker is 100% waterproof, submersible, and even floats. Let it sit outside in the rain or snow or drop it in a river - it keeps on playing. The EcoBoulder Max wirelessly connects via Bluetooth to your smartphone, tablet, or laptop with up to 100ft of range. A simple touch of the EcoTalk button activates the built-in microphone connecting you with Siri or ok Google voice assistants. Includes AUX in & USB charge port, AM/FM radio with 5 presets. Up to 50 hours of Playtime/100 Hours Standby. Wirelessly connect up to 50 EcoBoulder Max's with EcoCast.