With Reset Function-mdw Accessory Pack for Fitbit Flex- Includes Replacement Charger,security Fastener and Necklace/key Chain Silicon Holder. replacement charger with reset function. with reset function, you need a spare charger with rest function. many tiny problem can be solved after rebooting the device These silicone fasteners are designed specially for fitbit flex to protect the clasp loose and band fall off,it's a must have for fitbit flex secure the wristband in style, do not lost some $100 investment ! includes a replacement charger ,21 pcs silicon fasteners and a silicon keychain style holder for fitbit flex