... used after 1 year. 4. PCB boardWe use high quality of PCB board with circuit protection system, it can protect ... the iphone sheath. Turn on the iphone sheath power switch to (ON), then charging sheath will charge for ... ,solar panel in the sunshine ,turn on the switch to (ON),it will charge for the cell phone ... directly ,Turn off the switch to (OFF),the electricity will be stored to ...