ANTAPRCIS Professional Wireless Floating Thermometer Digital for Swmming Pool Spa Waterproof and floating:The wireless pool and spa thermometer is waterproof and floats on the surface of the water Reset operation: LCD display fully for 2 seconds, then enter clock non-setting mode Clock mode: In normal clock mode, LCD displays indoor temperature, water temperature,month,date,week,hour,minute,second,and reception channel Alarm: In normal clock mode, press "MODE" to enter alarm mode. LCD displays indoor temperature, water temperature,month,date,week,hour,minute,and reception channel Power:Receiver powered by 2 x AAA 1.5V battery (Battery not included), Transmitter Powered by 2 x AA 1.5V battery (Battery not included)Before using,please make sure the batteries are correct install.