The ECOXGEAR EcoRoam 20 is an IPX7 waterproof Bluetooth speaker with compact and rugged styling. It features a booming 15-watt speaker and large passive subwoofer. The EcoRoam 20 has incredible sound in a portable package and is still tough enough for every outdoor adventure. Connect an audio device using the 3.5mm cable connection or connect to your smartphone via Bluetooth. When connected to the AUX-IN connection, volume level must be controlled from the audio device. Use the EcoTalk feature to activate the voice assistant on your device (Siri, OK Google, etc.). Once activated, the speakerphone mic on the EcoRoam 20 will hear your voice commands and transfer them to the voice assistant on your device. The EcoRoam 20 has a separate master power switch and standby power button. When not in use for extended periods of time, turn the master power off to preserve battery life. Use the included USB cable to charge the EcoRoam 20 using the USB connection to your computer or to a power outlet using a 5V, 1A USB to AC power adapter (not included). The EcoRoam 20 can be charged while playing audio. You can pair two EcoRoam 20 Speakers (sold separately) for stereo sound. The pairing range is 30-feet and transmits Bluetooth audio only.