Telex TR-825 2-Channel Binaural UHF TransceiverTelex TR-800 2-Channel UHF TransceiverSpare Parts KitCondition:* Used/surplus parts. Unable to test. Sold as-is, not working, for parts* 13x TR-825 units* 6x TR-800 units* Assorted Spare Parts.Additional Notes:* 2-Channel Binaural UHF Operation* A4M Telex Headset Jack* Channel Search* Full Duplex Communication* LCD Interface* Frequency Range, TR-825: Receive: 590-608 MHz Transmit: 470-488 MHz* Frequency Range, TR-800: Receive: 518-536 MHz Transmit: 632-650 MHzTelexTR-825TR-800