HP 2730P, 2740P, 2760P ULTRA-SLIM DVD&plusmn;RW DOCKING STATION Adaptable mobile expansion solution. Add the HP 2700 Series Ultra-slim Battery and get up to 11 hours of run time when used in conjunction with your primary battery. Dock your notebook while in the office or on the road  no need to plug and unplug your peripherals. 9.5mm DVD+/-RW SuperMulti Drive included.