What's included: built-in rechargeable battery, and AC power adapter. Draft shield is included only on models with a pan size of 4-3/4 inch (12cm). (units with large pans can use an external draft shield sold separately) an excellent choice for quality and affordable precision weighing the most popular weighing features at an economical cost internal rechargeable battery for portability and convenience RS-232 interface allows for communication with a printer print function for GLP compliance capacity tracker warns of approaching overloads security lock-down port.