1. Temperature units [C/] can be switched for display 2. Wireless transmission distance: 100 metres in open areas 3. Records maximum and minimum values within 24 hours 4. Backlight function 5. Low battery alert Outdoor temperature maximum and minimum values High/low temperature alarm function The receiver has a support stand on the back for placement, wall-mounting holes, and a magnet on the back for magnetic attachment. The transmitter has wall-mounting holes on the back Power supply: Receiver: DC power cable/2xAAA batteries; Transmitter: 2xAAA batteries Note: Batteries are not included in the product shipment Indoor temperature detection range: -9.9C to 60C (-14.2F to 140F) Indoor humidity detection range: 10% to 99% RH Outdoor temperature detection range: -40C to 60C (-40F to 140F) Color: White Material: ABS Package Contents: 1 x Receiver 2 x Transmitter 1 cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.