The Entel CMP/DT9 is attached with a revolving clip and allows the radio user to carry the radio on their belt and have the facility to both make and receive calls without removing their radio. This keeps the radio safe and ensures that calls are not missed, especially in noisy environments.Submersible IP67 (1 meter for 30 minutes)Speaker impendance 8 ohmsMicrophone impendance <680 ohmsOutput sound level pressure 80dbA +/- 10dBRated input 500 mWMaximum input 1 W