1.Cross-Band  Repeater Function.

Turn on the cross-band repeater function(menu 6). You can choose a 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.
The Cross-Band  Repeater function also can increase the distance of communication. If you choose a 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) are 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 the same as other radios. Other radios can "watch" two channels.  Monitor 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 menu 35. MAIN indicates the main frequency sound is louder when receiving, SUB is indicated the sub frequency sound is louder when receiving. OFF indicates both main and sub frequency have the 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 the 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 choose the transmit channel. Push PTT transmit the main-channel, push another side key will transmit the sub-channel. Very convenient.

4.360  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.

1.Dual  Band Dual Display Dual Standby Handheld Radio
2.128  Memory Channel
3.360  Degree Channel Knob
4.Cross-Band  Repeater Function(VHF to UHF or UHF to VHF)
5.Frequency  offset and direction programmable in repeater mode
6.Dual  PTT(Side key can setup Sub-Ch transmit)
7.Dual  Receiving(RX on the same/different bands of A&B areas simultaneously)
8.VFO/MR/CH  Mode
9.1600mAh
10.Battery  Save
11.Strong  and Stable Output Power (High:5W/4W,Low:1W)
12.CTCSS/DCS
13.Scan(3  kinds of scan:Time,Carrier,Search)
14.VOX
15.TOT
16.SQL
17.PTT  ID
18.FM
19.Multi  Definition for Sidekeys
20.DTMF  Encoding&Decoding
21.All/Group/selective call
22.Reverse  Frequency
23.Remote  Alarm
24.Wide/Narrow  Bandwidth Slection(25KHz/12.5KHz)
25.Voice  Guide:Chinese/English
26.Chinese/English  Screen Display
27.Single-Tone  Pulse Frequency:2100Hz/1750Hz/1450Hz/1000Hz(Signalling for activating repeater)