1.Cross-Band  Repeater Function.

Turn  on the cross-band repeater function(menu 6). You can choose one-way or  two way repeater(menu 34). One way(single) means the repeater's receive and  transmit frequencies are specific. The radio will show 162R2375,426T2375. It  indicates the repeater only can receive 162.2375,transmit 426.2375. Two  way(double) means the repeater's receive and transmit frequencies are random.  The radio will show 162*2375,426*2375. It indicates the repeater not only can  receive 162.2375,transmit 426.2375, but also can receive 426.2375,transmit 162.2375.
Cross-Band  Repeater function also can increase the distance of communication. If  you choose two way repeater, it can make the UHF radio communicate with VHF  radio. When you turn on the repeater function, you also can set if the  radio PTT Transmitting(menu 33) and Speaker(menu 32) is available.

For  example:
(1)RT23  radio A: RX 426.2375MHz, Offset: - 264.000MHz
RT23  radio B: RX 426.2375MHz, Offset: - 264.000MHz
RT23  radio C: Repeater RX 162.2375MHz, Offset: + 264.000MHz
Radio  A could communicate with Radio B,It also can increase the distance of  communication.
(2)RT23  radio A: RX&TX 162.2375MHz
RT23  radio B: RX&TX 426.2375MHz,
RT23  radio C: Two-way Repeater 162.2375MHz, Offset: + 264.000MHz
Radio  A could communicate with Radio B

2.Dual  Receive

RT23  is not same with other radios. Other radios can "watch" two channels.  Mointor two different frequencies(even on different bands (VHF/UHF)) and the  radio will monitor both frequencies giving priority to the first station to  receive an incoming call. RT23 not only can "watch" both  frequencies, but also can receive two incoming calls at the same time. What  is more,you can set the volume mode by the menu 35. MAIN indicates the main  frequency sound is louder when receiving, SUB is indicates the sub frequency  sound is lounder when receiving. OFF indicates both main and sub frequency have  same sound.

For  example:
RT23  radio A: TX/RX 162.2375MHz,
RT23  radio B: TX/RX 426.2375MHz,
RT23  radio C: Dual Standby 426.2375MHz, 162.2375MHz,
Radio  C can receive voice of Radio A&B at the same time.

3.Dual  PTT

You  can set a Sub-PTT by side key. If so you need not to choose the transmit  channel. Push PTT transmit the main-channel, push another side key will  transmit the sub-channel. Very convenient.

4.306  Degree Channel Knob

The  channel knob can rotate 360 degree. You can operate the menu up and down by  this knob. It is very convenient.