The C860 was created as a beltpack companion for the C960 headset system and has been discontinued for several years. The C860 shares many components with the C960 & C1025 such as the battery charger, batteries and programming cable. ESS still services the C860 with 3M OEM parts, but some parts have been discontinued, so there is limited availability.
PAR Documentation
PDF files for the PAR C860
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C960/C1025/C860 Programming Instructions
Program your C860 beltpack transceiver if you hear static, have trouble hearing or talking. You must also reprogram if you have changed your channels.