The Eagles Nest Outfitters Echo Bluetooth Speaker not only weighs next to nothing and fits conveniently in any pocket, purse or festival pack, but its hammock specific design and built in hanging hook angles the speaker for an optimized listening experience. Packs a huge audio punch for such a little package. Rechargeable Echo comes with an included micro USB cable. Crank it up! Hammock specific design. Built in hanging look angles the speaker to optimize listening experience. Water resistant IPX4. Bluetooth compatible. 3 hour battery life. Rechargeable battery and micro USB included. Ability to send and receive calls.