Built-in 18650 lithium battery 7800mAh provides approx. 2.5 hours. Battery: 18650 Lithium Battery 7800mAh. Long press 2 seconds to power on. Complete accessory kit includes: shower head, shower wand, shower hose, storage bag, shower bracket with suction cup, charging cable, sealing gaskets – ready to use right out of the box.
eBay