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The EU unit has a Alphanumeric standard keypad shorter range due to regulatory restrictions on power output in the 2.4 GHz frequency band Loudspeaker in the EU. Volume: 90dBspl A weighted @ 1 ft Bandwidth: 200 Hz–3.3 kHz Environmental Operating temperature: 32–118° F (0–48° C) Record Output Storage temperature: 41–158° F (5–70° C) Connector: 2.5 mm mono audio jack Operating humidity: 15 to 80% Impedance: <1000 ohms Storage humidity: 10 to 90% Bandwidth: 200Hz–3.3kHz Dynamic range: 60dB Dimension