Ready to use: : This waterproof wireless doorbell for home is paired before delivery. No wiring or electrician installation is required during use, and installation can be done in 1 minute: plug the receiver into the outlet and it's ready to use. HD Display for Temperature, Humidity and Time: The wireless doorbell is equipped with temperature and humidity sensor, which can know the indoor environment temperature and humidity change in real time, so that you can enjoy a healthy life. The time reminder function makes sure you never miss any important moment again. Weather resistance and energy: : The wireless battery-free doorbell is made of high quality ABS material, which has excellent flame retardant and flame retardant properties. Operating temperature : -4F -140F. IP45 dustproof and waterproof protection. The transmitter adopts high-end self-generation performance and does not need to install batteries. Exquisite appearance and high quality: : The doorbell has updated 38 songs and 4 levels of adjustable volume. With 4 adjustable volume levels (with mute function) from 0dB to 100dB.We have advanced automation equipment, high precision placement. Product Description Technical data: Plug-in receiver voltage: AC85-260V (US, EU, UK, AU) Power Consumption: Issuer : 20mA, Receiver: 140 mA Waterproof index: IP44 (P, N, T model) Transmitter: Transmitter duration 200,000 times, pressure 3-4 N. Operating range: more than 150 meters in area open Selectable ringtone: 38 melodies Volume range: 0-100 dB, 4 levels Operating frequency: 433.92 MHz Operating temperature: -20 -65 . Precautions: Wireless signals are susceptible to obstructions such as metal, walls, concrete, etc. 1. Open the package, try the specific installation position first, then fix the bottom covers of the transmitter with the adhesive tape on both sides. 2. Ifthereceiving distance is extremely short, avoidit on metal door or metal door frame. Please change the position of the receiver. 3. The receiver should be as far away as possible from places with magnetic fields or sources of signal interference such as induction cookers, televisions and speakers. 4. The closer the receiver receives to a straight line, the stronger the signal will be. Non-professionals should not open the repairs yourself, in order to avoid damage to the electronic components of precision. Please avoid prolonged exposure and installation in metal places. The correct use of this product can effectively extend the service life. Actual use of remote control distance is reduced depending on environmental factors. Package content: 1 transmitter. 1 receiver. Note: Due to manual measurement, please allow a difference of 0-3cm. Thank you for your understanding. The monitor calibration method is different. The color of the product shown in the photo may be slightly different from the actual product. Please refer to our size before ordering. Delivery quantity: 2 rooms