Reviser RT DMR radio with dual frequency range, up to 3000 channel and contacts list, 2200 mAh battery enable it normal use for about 8-12 hours; standby time for about 150 hours; Dual watch supports to monitor 2 frequencies al the same time; dual time slot for point to point give you chance fo experience two group calls in one channel under direct mode: 100% P67 waterproof and dust-proof support water-immersible in up to one meter of water for 30 minuses