HMDX HX-GO3BKA-4PK GO SPEAKER (Blue)PORTABLE SPEAKER CASE; BATTERY OPERATED ; EXTERNAL VOLUME CONTROL; AUX-IN FOR CONNECTING MUSIC DEVICES; CLIPS TO BAGS, BELTS, BACKPACKS & MORE; STORES & PROTECTS DEVICES & HEADPHONES ( WILL NOT FIT GALAXY S3); REQUIRES 3 AAA BATTERIES;