Logitech Wireless Presenter R400 for Windows Computers & Laptops(Black)Brand Logitech Manufacturer Logitech, Logitech Colour Black Form Factor Palm held Item Height 0. 02 Centimeters Item Width 0. 02 Centimeters Standing screen display size 24 Inches Product Dimensions 0. 02 x 0. 02 x 0. 02 cm; 57 g Batteries 2 Lithium Metal batteries required. (included) Item model number 910 001356 Processor Count 1 Computer Memory Type DDR3 SDRAM Memory Clock Speed 1800 Connectivity Type wireless Wireless Type 802. 11a Voltage 3 Volts