The transmission distance between the host and the sensor is 60 meters. You can view the temperature and humidity data indoors. The transmitter is waterproof and can be directly placed in the pool for use. You can set the alarm snooze mode and 10s backlight You can display the real-time temperature of the water area where the sensor is located and the real-time temperature and humidity of the room where the host is located on the same screen You can view the highest and lowest temperature records of the day Specifications: Time display: 12/24 hours optional Indoor host temperature detection range: -9.9℃~+50℃(14.2℉~122℉) Pool sensor temperature detection range: -40℃~+70℃(-40℉~158℉) Temperature error within +1℃, ℃/℉ optional, transmission distance 60 meters. Indoor humidity range: 20%RH~95%RH. Power supply: Host: 2x1.5V "AAA" alkaline batteries (not included in shipment) Sensor: 2x1.5V "AAA" alkaline batteries (not included in shipment) Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Color: As Shown Material: ABS Package Contents: 1 x indoor temperature host 1 x outdoor sensor 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.