This is a stylish unit ideal for a desk top. It features an outdoor remote transmitter that displays temperature and humidity itself, which is handy when you are outdoors and need to know these things. The transmitter requires 2 x AA batteries (which last for ages - using good batteries such as SB2902 ). It has a hook hanger but will sit up on a flat surface. Range 30-50m. The console unit has a high contrast 125(diagonal) x 70(W)mm monochromatic display with a pleasant amber backlight. It also has an alarm with snooze function, and the ability to have 3 sensors transmitting data to the display unit for monitoring 3 environments at once, such as your garage, kids room or pantry. Other features include: Large time display Date/Day alarm time Moon phase Indoor/Outdoor Temperature/Humidity Limited weather forecast Requires 2 x AA batteries Active display area measures 125 (diagonal) x 70(W)mm Up to 3 sensors work at once with the main console for monitoring in more than one location Optional replacment transmitter XC0413 - requires 2 x AA batteries Transmission frequency : 433.0MHz Transmission range : 30.0m Receiver Antenna Style : Internal Antenna Transmitter Antenna Style : Internal Antenna Measures in Celcius : true Measures in Fahrenheit : true Display Type : LCD Display Height : 105.0mm Display Width : 70.0mm Dimensions for : Receiver Width : 85.0mm Height : 144.0mm Depth : 51.0mm Weight : 190.0g Battery used for : Receiver Size / Shape : AA Type : Alkaline Battery quantity : 2.0pc Batteries included : false Batteries can be replaced by user : true Weather Station Style : Weather Station Calender : true Sensor Type : Remote wireless sensor Sensor Battery Size : AA Sensor Battery Quantity : 2.0pc Sensor Battery Type : Alkaline Dimension for : Transmitter Width : 65.0mm Height : 100.0mm Depth : 35.0mm Weight : 75.0g Dimensions for : Display Screen Dimension details : LCD Screen Width : 70.0mm Height : 105.0mm