Place the indoor unit to view data such as time, temperature, and humidity. The transmitter is placed in an outdoor pool to collect data and then transmit it to the indoor unit. The transmission distance for the outdoor sensor is 60 meters. Upgrade and optimize the waterproof and sealing properties to ensure that the product does not leak or cause any negative problems. Time display: 12/24H optional. It can display the real-time temperature of the water area where the sensor is located and the indoor unit's real-time indoor temperature on the same screen. Supports recording today's highest and lowest temperatures. Indoor and outdoor temperature display: ℃/℉ optional. Indoor host temperature detection range: -9.9℃ ~+50℃ (14.2℉ ~122℉). The temperature detection range of the water tank sensor is -40℃ ~+70℃ (-40℉ ~158℉). The temperature error is within 1℃, and the transmission distance is 60 meters. Power supply: Indoor host: 2x1.5V AAA alkaline battery (not included in delivery). Outdoor sensor: 2x1.5V AAA alkaline battery (not included in delivery). Specification Introduction (1) Package size: 14.5 * 9.5 * 9.5 cm (2) Package weight: 290g (3) Common packing list: 1 * Host, 1 * Outdoor unit for pool temperature, 1 * Outdoor unit Swimming pool hanging rope, 1 * Instructions in five languages