Handheld Remote Control USB + Wireless RF pen hand. Range of 50 to 100 meters according to architectural onditions. Frequency: 2.4GHz. Rechargeable 300 mAh battery via USB. Step speed control and adjustment. Functions of jump to text / previous or later news. Adapted to any TVPROMPT software. Driver included in the corresponding software of TVPROMPT. Automatic time-out for battery saving. LED with low battery indicator. Mini type receiver compatible with USB 1.1, 2.0 and 3.0 specifications. USB cable included.Clique aqui para mais informação