Solar Powered: Solar charging, no need to replace the battery.Specifications: Material: ABS Machine size :11.8cm X7.4cm X2.0cm/4.64 X2.91 X0.78inch Remote distance: RF 433MHz 300Feet (100 Meter) Update rate: on the remote control,10 seconds display console.Measurements: Indoor Temperature: 0DegreeC~50DegreeC; 32DegreeF~122DegreeF Outdoor Temperature: 40DegreeC ~ 60DegreeC; 40DegreeF~140DegreeF Temperature accuracy: ±1.0DegreeFDescription: This product USES the high quality sensor, the sensor directly contacts with the water, the measurement temperature is more accurate. Wireless transmission, more than 120 meters away. Solar Powered: Solar charging, no need to replace the battery. Super bright LED backlight. It is widely used to measure water temperature in bathtub, swimming pool, fish pond,racerice, etc.Package included: 1 X wireless pool thermometer transmitter(not include battery) 1 X wireless pool thermometer receiver(not include battery) 1 X User manual