Model DW-860 has built-in battery compartment with sealed cap that enables access to 3 AA batteries. Sealed enclosure design is intended to readily accommodate mobile and wireless users. Integrated HulaPoint II joystick-like pointing device eliminates need for external mouse. Supplied in 11.393 x 6.317 x 1.588 in. polycarbonate case, rugged keyboard offers WirelessUSB technology, 30 ft RF range, and no line-of-site limitations.