Numark 5000FX 12" 5-Channel Tabletop DJ Mixer with Sampling, Looping, and FX It is solar panel. The state-of-the-art solar panel allows continuous charging from the sun. Integrated rechargeable 1500 mAh 3.7 V lithium-ion polymer battery offers 120% capacity of iPod. Advanced lithium-ion polymer battery cell technology prevents overcharging.