I found the description of the wireless weather station model WH 1281:
Wireless weather station Model no: WH 1281 Description This wireless weather station, designed for daily use, will prove to be a great asset for your personal usage at home or in the office. Features 1) Humidity level (% HR) 2) Wireless outdoor and indoor temperature (°C or °F) 3) Records min. and max. humidity 4) Records min. and max. temperature 5) Weather forecasts trend 6) Forecast icons based on barometric pressure changes 7) Radio-controlled time and date with manual setting option (WH1280 only) 8) Time zone setting 9) 12 or 24-hour display 10) Perpetual calendar 11) Alarm time 12) Can receive up to 3 sensors 13) LED backlighting 14) Wall-mounted or free-standing 15) Includes a transmitter 16) Instant synchronized reception 17) Low battery indicator on the receiver
Specifications Outdoor data Transmission distance in open field: 100 meters max. Frequency: 433 MHz Temperature range: -40 °C to +65 °C (show OFL if outside range) Resolution: 0.1 °C Sensor distance measurement interval: 48 sec Waterproof level: IPX3 Indoor data Pressure/Temperature: 48 sec Indoor temperature range: -9.9 °C to +80 °C Resolution: 0.1 °C Measured range of REL. Humidity: 20% ~ 99% Resolution: 1% Measured air pressure range: 919hPa-1080hPa Resolution/accuracy: 0.1hPa/1.5hPa Alarm duration: 120 sec Power consumption Base station: 2xAA 1.5 V alkaline LR6 batteries (not included) Remote sensor: 2 AAA 1.5 V alkaline LR03 batteries (not included)
Package contents: 1x weather station base unit 1x remote sensor with mounting bracket Mounting screws Instruction manual