JBL Clip+ Splashproof Bluetooth Speaker, 4.21"H x 3.46"W x 1.65"D, Black $22 or Teal $19

JBL splashproof speaker lets you tune in on land or in water.
Provides up to 5 hours of playtime for your longest playlists.
Bluetooth technology allows for wireless streaming.
3.5 mm audio cable plugs into your phone, laptop or tablet.
Built-in carabiner — clips to your belt loop, key chain or backpack!