Check the listing for details. TELEX ​ADHB-4 Advanced Digital Headset Box. Condition: Used. Listed at 764.00 USD. TELEX ​ADHB-4 Advanced Digital Headset Box Description : ADHB-4 Advanced Digital Headset Box. If you have any questions, please contact us (M-F: 8AM-4PM) Mountain Time.Features:Ethernet Communication Six (6) Audio ChannelsFull color LCD ScreenOne (1) Dual Channel 1/4” Headset JackOne (1) XLR Connector to Accept any Low Impedance MicrophoneOne (1) Desk Mic JackOne (1) Phone JackOne (1) NENA I/O Jack with Offhook DetectionSeparate Headset Volume Control Knobs for SelectSupports up to Three (3) pairs of speakersAny standard amplified speakerLED Power and PTT Indicator12VDC OperationTwo (2) Headset Jacks to Support Two (2) Remote Headset BoxesADHB-4 provides power to an RHBDual channel 1/4” headset jackVolume control knob NOTE: If your order includes programming, please email us a request for our Programming Form after checkout. We will only program up to 16 channels and do not program for trunking systems (Programming must be submitted within 24 hours of your purchase).