Before the indoor display displays the data received from the outdoor transmitter, please do not any button. If the display cannot display the temperature from the outdoor transmitter, please check whether the distance between the outdoor transmitter and the display is within the allowable range. Equipped with installation accessories and assembly drawings, users can install the transmitter in a suitable outdoor location after the installation. Widely Used: Designed for monitoring the temperatures for swimming pool, heated pool, wood fired tubs. Features: 1. Solar power 2. Indoor temperature 3. Water temperature 4. Radio controlled time 5. Calendar 6. Alarm clock Please ALWAYS install outdoor transmitter (sensor) battery first, and then install indoor receiver (display) battery. Otherwise can not connect and meter not display. Colour:As Shown Material:Plastic Size:11.3x7.4x1.4cm Package Contents: 1 * Host 1 * Swimming pool temperature outdoor unit 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.