Sony XM-GS100 Mono Amplifier (Black)

Long Battery Life : Battery life up to 16 hours for long listening hours
Extra Bass : Get things going with EXTRA BASS. A passive radiator works with the mono speaker to enhance low-end tones, giving bass a boost despite the compact size
Totally waterproof : With an IP67 rating, the speaker can survive being dropped in water, so the odd rain shower or accidental spillage won’t pose any problems.
Totally dustproof : Thanks to the IP67 rating, you can take your speaker to the pool or wherever you like. The speaker will keep on playing, no matter how dusty the surface.
Built-In Mic : Built-in mic for hands free calling
Usage : Supplied detachable strap for easy ususage
Small and light design : The SRS-XB12 is compact, wireless and made to go with you anywhere. With a detachable strap you can easily hang it up and keep your music going on the move.