Double battery means two batteries, lasts longer with use. USB output to charge from or power anything like a phone, lights, etc. Lighting power is 120 watts. The lighting is shown in the picture and video. You can make it wide-angle lighting or a straight beam that reaches long distances. The lighting is very strong. The quality of the spotlight is excellent. The lens spotlight is better than the yellow one. For fishing, desert trips, camping, and engineering.