Details Functions with FSII base, FreeSpeak Edge base, Arcadia Central Station, E-IPA-HX card, and FSII splitter hardware Designed to work at atmospheric pressure up to 75 psi Typical indoor range: 300 ft (90m), outdoor range: 800 ft (240 m) 1.9 and 2.4 GHz beltpacks operate on a single system Up to 65 - 90 beltpacks on a single system "Listen Again" message replay Simple 2-channel partyline operation to 5-channel intercom on the same beltpack Over-the-air beltpack registration XLR-4M headset connector IP53 rating for wet and dusty conditions Built-in flashlight Uses AA alkaline or rechargeable Nickel Metal Hydride batteries Item Code FSII-BP24-X4-O2-US: for high pressure environments XLR-4M headset connector for use in USA; Canada; Mexico FSII-BP24-X4-O2-EU: XLR-7M headset connector for use in EU countries only Technical Specifications Audio Audio Bandwidth: 200Hz-7.5KHz No. of Full-Duplex Audio Paths: Up to 5 with individual level control (2 dedicated rotaries, 3 with menu), 2 controls and a main volume Mode of Operation: Full duplex on all routes Level/Talk Controls: 4 pushbuttons, a reply button and 2 rotary controls Enter/Answer-Back Button: 1 Radio Frequency Spectrum: 2.400-2.483MHz for EU and US cellular auto roaming technology Modulation: GFSK, TDMA frame 10ms full slot Output power: (EU) 18dBm, (RoW) 22dBm Range: Typical indoor range 300ft (90m), outdoor range 800ft (240m) Battery: 3 AA alkaline or Nickel Metal Hydride Battery Life: 9+ hours Headset Connector: 4-pin male Microphone Type: Electret and Dynamic, selectable in beltpack menu Headset Limiter: Selectable from beltpack menu Environmental IP53 water and dust resistance Operating: 32º-125ºF (0º-50ºC) Storage: 32º-150ºF (0º-70ºC) Humidity: Between 20% and 90%, Non-Condensing Atmospheric pressures of 5.1 atm or 75 psi Dimensions Tapered design at largest points 3.75 x 5 x 1.5in (HxWxD) (97 x 130 x 45mm) Weight 9.0 oz (0.25 kg) including batteries