Product Review

It prevents condensation by warming up the lens on a camera or telescope. This is a high-output model suitable for cold and highly humid environment. It has been tested for its effectiveness against condensation outdoors in winter time, when the temperature drops below 32 F. Proven effectiveness against condensation, outside in a field, at a temperature of 5 F. [Unit dimensions] 2.2inx0.2inx17.3in (widthxthicknessxlength) USB cable length: 56.7in [Unit weight] about 2.1 oz [Power source] USB [Power consumption] about 5V 1A 5W [Operating time] about 6-10 hours (for a new portable 10,000 mAh battery) *Operating time is merely listed as reference. It varies with the external temperature and the specifications of your portable battery. [Warning] A portable battery is required to operate this product (a portable battery with greater than 10,000 mAh capacity is recommended). * Portable battery is not included in this product. It must be purchased separately.