Red: Dare to go where traditional chargers cannot with Premium’s USB Carrying Case. Grab 1 Classic or Queen model battery, 2 signature cartridges and enjoy up to 4 full charges. The vibrant Red Charging Case will protect your products while offering you the convenience vaping without missing a beat. Structure: -The USB case contains an internal battery. -There are 2 lights located inside the case. -The top light shows the charge of the USB case. -The bottom light in the case indicates the charge of the Premium electronic cigarette battery. Charging: -When you plug the case into the USB port, the top light will turn red indicating that the USB case battery is charging. -It will take approximately 3-5 hours to fully recharge the USB case battery. -When charging the battery, the bottom light will be steady red. -Once the electronic cigarette battery is fully charged, the bottom light will start blinking. -Please allow 2-4 hours to fully charge the electronic cigarette battery. -The USB case is designed to recharge electronic cigarette battery at least 4 times before you have to recharge the case. You are now ready to enjoy all the functions of your USB Carrying Case!