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Features Barometric, Humidity and Temperature on LCD screen; One channel to work with one HP2550/HP3500 display only; Indoor Humidity & Temperature coded for upgrade HP2550/HP3500 Specifications Measurement Range Accuracy Resolution Barometric 300 to 1100 hPa (8.85 to 32.5 inHg) ± 5hPa 0.1hPa (0.01 inHg) Temperature (Indoor) -10°C to 60°C (-14°F to 140°F) ± 0.3°C (± 0.6°F) 0.1°C (0.1°F) Humidity (Indoor) 1% to 99% ± 5% 1% However the screen display of the sensor might not work below 14F(-10C). Battery: 2 x AA 1.5V battery  Transmission between gateway and sensor Transmission distance in open field: 100 m (330 ft.) depend on environment RF frequency: 433/868/915 MHz depending on location Updates on the gateway: About 64 seconds Channel: One only Parts List 1 * sensor Packaged information Length * Width * Height: 123*42*14mm Weight: 140g Battery: No

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