Portofoon GMDSS HT649 package 2, including:GMDSS battery, CNB 750 battery (Lition/Ion) and Charger- Environmental protection to IP68 (2 meters for 4 hours)- Battery Type: Primary – Lithium Secondary - 2000 mAh Li-Ion- Frequency Range: 156 - 163.275MHz - Channels: 19 INT, USA & CAN Marine Channels- Channel Spacing: 25 kHz - Communication Method: Simplex / semi duplex- Antenna Impedance: 50 ohm - Power Supply Voltage: 7.4V DC- Current Drain (nominal): 40mA - Microphone: Internal condenser microphone- Primary Duty Cycle (10/10/80) > 8 Hours - Secondary Duty Cycle (5/5/90): 14.5 hours- Operating Temperature: -20° to +55°C - Construction: MIL-STD 810C/D/E/F