Wireless One ST-XLSL Sound Tube XL Premium Bluetooth Speaker - Retail Packaging - Silver Compatible with most bluetooth enabled devices Individual buttons to control volume and music tracks Aluminum case design Supports microSD cards up to 16GB Battery Powered and 3W output Compatible with most Bluetooth enabled devices, Individual buttons to control volume and music tracks, Aluminum case design, Supports microSD cards up to 16GB, Battery Powered and 3W output