Unconventional pattern design; More skilled in connotation which makes the box reliable and durable; The detachable design of the box body and terminal is convenient in maintenance and provides an innovation platform; Sidewall compressed O-ring helps the box easily reach IP65; R6 circuit adheres closely to the copper sidewall and smoothes the box temperature; The one-way breathable film technology balances the inside and outside temperature and pressure. Approved by TUV and UL, and universally accepted. QC Solar, innovation everywhere!