Dual time slot for point to point supports two group calls in one channel under direct model supports dtmf connecting.Gps function gives you latlong altitude bearing and speed information sms function support to text the information to another radio with the same dmr protocol.Tri group call models make you call freely without the group restrictions supports to save 32 radio id and edit radio id via keypad special digital secure system allows team members communicate safely.Ip67 waterproof and dustproof can be immersed in 1 meter of water for 30 minutes and can easily cope with complex outdoor environments.Hd1 battery 3200mah capacity very big battery capacity allow long standby time.The hd1 can save up to 200000 contacts 32 radio id priority contacts allow you to edit delete via radio keypad address book allows you to import and export via the cps group calls provide secure team communications.Supports dual time slot and point to point giving you chance to experience two group calls in one channel under direct model supports dtmf keyboard dialing compatible with motorola tier &.Audio and reception for both analog and dmr mode are excellent its more sleek less bulky and much more hand held easy to operate through one hand.Clear big lcd display is visible in day or night ideal for outdoor activities.Almost all the function setting can be achieve via keypad without connecting computer access to many menu settings totally save your time.promiscuous mode enables it to hear all talk groups, not just one associated with the receiving group when the time slot and the color code in the channel settings.

Digital/analog mode + promiscuous mode it allows monitoring both the dmr community and stay in touch with your friends on the local analog repeaters at the same time.

Works well with hotspot/repeater this solid and rugged radio works on simplex (radio to radio direct), as well as work in conjunction with a hotspot device or repeaters.furthermore, radioddity is always here to help. How to get on air with gd-77? for any concerns, please refer to the users guide & user manual under technical specification.newest firmware v4.3.6 and software v3.1.9 for bugs fixing or features upgrade, which are available from radioddity. Updatable software & firmware support all settings can be programmed with a supplied cable via pc (window 7/8/10 only, mac/linux not supported).Exceptional audio quality you will be surprised for the crystal clear sound and the noise-free on the transmit audio, it doesn't get distorted when the volume is turned up.

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