La Crosse Technology WS-9009BK-IT-CBP wireless temperature station provides you with accurate information now. With its 915 MHz frequency, you will have the convenience of fast updates (every 30 seconds), longer wireless range (up to 260 feet), and extended battery life (up to 24 months.) Displays your indoor & outdoor temperature (°F) and records the MIN/MAX values.Below is the proper set up: 1. Put the batteries into the remote sensor. ( the display and sensor should be 3-5 feet apart with nothing in between. 2. Taking care not to press any buttons, reinstall the batteries in the display. 3. Do not press any buttons for at least 10 minutes after installing the batteries. (Let them establish a good connection.) 4. An outdoor temperature should be showing on your display. You can now put your outdoor sensor back outside. The maximum open-air distance is 80 feet in a straight line although you should take into account distance and resistance. Subtract 25-30 feet for an exterior wall or any obstruction that is similar in width or composition. Subtract 15-20 feet per interior wall or any obstruction that is similar in width or composition. (An obstruction would include anything that is between the line of sight like a roof, walls, floors, ceilings, trees, etc.) Also keep your units away from electronic appliances like TV’s, microwaves, computers, refrigerators, and speakers. We have trouble maintaining a signal through metal siding, stucco walls, and UV glass. You can get the remote sensor to transmit through these materials, but it will take a little bit of trial and error. Reset the weather station as mentioned above and change the angle that the remote transmits through the siding or glass until an outdoor temperature remains on the display for an extended period of time. Keep in mind that the signal from the remote must travel through some space (3 inches of air minimum) before reaching the metal wall or glass window.