We purchased it at target for $10. Has rechargeable battery and usb cord plus 3 speeds. Plan to use it behind outside refrigerator vent in very hot weather when sun is on refrigerator side of coach. It fits perfectly...picture...
Yes about 6 hrs on low speed. We got lucky and have 110 outlet within 4' of fan, just need to purchase usb to 110 plug adaptor.. Replacement rechargable battery is (18650,3.7v,2200mah) 4 pcs on amason for $5