The MT680 can act as a bridge between the trunked network (TMO) and units operating in Direct Mode (DMO). This is essential for maintaining communication in tunnels or underground facilities where network coverage is weak. Data Services & Messaging

Do not download from third-party sketchy PDF sites. Go directly to the or your local Hytera authorized dealer. Search for: "Hytera MT680 TETRA Mobile Terminal Owner's Manual V4.0.00 (EN)"

If you are upgrading from an older firmware version (such as R2.0 or R3.0), the following changes are highlighted in the R4.0 manual:

Equipped with a 2.8-inch TFT LCD (320 x 240 pixels) with 260K colors, optimized for sunlight readability. Positioning: Built-in GPS, GLONASS, and BeiDou. Bluetooth 4.0: Supports wireless audio accessories.