Altitude Nexus Bluetooth Speakerthis small and compact speaker will give you that extra sound boost when you feel like turning up the volume. 5. 3 ( h ) x 5. 8 ( dia ) abs supports playback from smartphones, tablets, or most other bluetooth compatible audio devices tf card function internal, rechargeable lithium polymer battery recharges via usb cable (included) nrcs approved, click here to view certification packaged in a gift box