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GR D2是小型、超聲波收發通訊設備，可用于2個以上潛水員或水面站之間的通訊。Buddy Phone D2由數字信號處理，聲音清晰。
Ø Nominal Range: 50 to 500 meters depending on sea conditions & noise levels.
Ø Transmission Type: Ultrasound using upper single sideband (USB)
Ø Transmit Output Power: 1/2 Watt PEP
Ø Standard Frequency: Freq. A (Channel 1): 32.768 kHz USB,
Freq. B (Channel 4): 31.250 kHz LSB
Ø Audio Bandwidth: 300 to 3,000 Hz
Ø Automatic Gain Control: Greater than 80 dB
Ø Earphone: Ceramic
Ø Microphone: ME-16R Hot-Mic (Dynamic) or Super Mic (Standard)(Ceramic)
Ø Transducer: Ceramic cylinder
Ø Battery Type: Alkaline 9V or Ultralife lithium 9V or 9V Li-polymer rechargeable. Batteries not included
Ø Maximum Operating Depth: 130 feet in sea water (fsw)
手機版：GR D2潛水員電話
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