The product does not include batteries. IP44 Waterproof & Temperature Display: The transmitter adopts waterproof design, made of ABS, non-toxic, safe and recyclable, can work at temperatures from -20 to 65, and can withstand various harsh weather conditions. LED temperature display, displays Celsius/Fahrenheit temperature when the receiver does not beep, can be used as an indoor thermometer. 38 Beautiful Ringtones and Melodies: Provides 38 classic melody ringtones with adjustable volume control, diversified choices to meet your needs. 0dB to 100dB 4-level adjustable volume, enough for the elderly to hear; you can enjoy a pleasant melody every time someone rings the doorbell. LED indicators provide you with visual notifications (a great feature for the hearing impaired). Long Wireless Range: The wireless range is 150m/500ft, which will not interfere with other devices in your home or neighbors; ensuring that you will not miss any visitors even if you are in several rooms or on different floors. Very suitable for homes, offices, hotels, villas, hospitals, offices, apartments, schools and other suitable areas. Note: The data are all measured manually, please allow 1-3cm error due to different light and display, there may be some color differences, please refer to the actual item received.