This slim charging cable easily packs into purses, backpacks and more, and plugs into any USB port, so you always have the power you need to track your routine. Cable Type: Charge-only cable Recommended Use: Activity tracker Connector: 4 pin USB Type A (power only) - male Designed For: Fitbit Flex 2 Cable: Charge-only cable Connector: USB (power only) - male Designed For: Fitbit Flex 2