Connect the system to any audio sources like TV, VCR, DVD, DVB, HI-FI, MP3, DAB and much more. 3 Channel operation. Operating distance up to 100m under ideal conditions. Unique Recharging Circuit. Wall mountable transmitter for easy recharging & storage. Easy recharge: Simply place the headphone on to the transmitter charging cradle. Rechargeable batteries included. 863-865MHz Radio Frequency Transmission. PLL (Phase-lock-loop) transmitter. Auto tune scanning headphone. DJ-fold feature headphone.