... wireless high-speed transmission technology, USB1.1 interface receiver;- up to 10 ± 2 meters effective distance;Frequency-hopping ... voltage is below 2.4V, the voltage indication LED lights, according to customer requirements for voltage regulation;- support for ... keyboard functions: If the number, direction, addition, subtraction, up / down, Home, End buttons;- compatible Windows98/Me/NT/2000/XP/VISTA ...