... designed to allow you to use anytime, anywhere, four battery-powered 4 hours. D: USB interface cable, you ... computer radiation Use of three ways: 1, the battery usage 2, use the computer USB 3, power ... in the handle, in hand with the next 1 Slide the battery compartment cover and remove the 2, the ... of four AA alkaline batteries new 3 Replace the battery compartment cover 4, long-term remove the batteries ...