1)no string frequency 2)It is convenient. 3) Faster connecting.clear sound,anti-interference. KS268-DFUNCTION:1.It is designed by 2.4G frequency band digital frequency-hopping and codec technology to realise non-string frequency, non-interference. The transmitter and the receiver can be equiped automatically ,easy to manage;2. It can connect to an external audio input (computer, DVD, MP3), volume ...