ETvalley Waterproof Outdoor Portable Mini Bluetooth Stereo Speakers, Mountain, Sea or Shower Speaker-Dustproof-Sand Proof &ndash; Green/Black The beautiful design of ETvalley Bluetooth speaker offers you the possibility to listen to music everywhere when you are travelling. It is waterproof and dustproof, no worry while travelling. Thanks to the Bluetooth and NFC function you are able to wirelessly connect any mobile devices to this speaker and enjoy your music everywhere. ETvalley created the speaker with built-in MIC Bluetooth speaker and hands-free, so you will be able to easily pick up phone call with this speaker in your car, bathroom, at home or office. You will be able to insert a memory card directly into the speaker so you will always have your music. The speaker battery will last up to 4 hours playing time and will automatically shut down if you dont use for 15 minutes.