SHARKK&reg; Mini Portable Speaker with Rechargeable Battery and Enhanced Bass Resonator Built in long lasting rechargeable battery charges in 3 hours and lasts 8 hours. Compact design with expandable top offers enhanced bass sound and convenient storage. Can be connected to other speakers (not included and sold separately) Built in 3.5mm cable to connect to all your music devices. To Turn On The Speaker: Press and Hold the Power button for 5 seconds. The blue LED will start blinking to indicate that the speaker is ready to use. To play music, simply connect the 3.5 mm connector on the bottom of the speaker to your mp3/music device and start playing music.