WOULDN'T YOU LOVE the convenience of an extra set of batteries so you can keep filming? This is the perfect set for you...WHAT IS IT:Dual Slot Charger for SJ7 with 2 X SJ7 Batteries is a nice addition to your camera set. It is manufactured with care by SJCAM and comes with a USB cord for charging. You must use a wall adapter to plug into the wall or you can use a car charger with a port for the USB.
EASE OF USE:Handy for travelling or when you're on the go. The dual slot charger lights up red when the battery needs charging and goes green when the battery is fully charged.
SIZE:Fits into a pocket and is about 1 inch by 2 inches long. The batteries are about 1 1/4" X 1 1/4" by 1/4" and are rechargeable.