Innovative & Dual-PurposeDoorbell and thermometer combo. After the receiver is plugged into the power supply, its built-in professional electronic temperature sensor will automatically detect the ambient temperature and display the temperature in real time. and Display Toggle.Monitoring real-time indoor temperature changes brings you a healthy lifestyle. High Quality SpeakerThe built-in high-quality speaker provides up to 100 dB tones, so you won't miss any visitor even in the noisiest of environments. Anti-Interference & Ultra-Long DistanceWith the exclusive frequency band signal (433.92MHz), the anti-interference transmission distance is up to 1000ft, which is 3 times the distance of other doorbells. Ultra-long distance working range is suitable for villas, gardens, apartments, offices, hospitals, warehouses, and more. Waterproof & DurableThe transmitter's IP44 structure can withstand the harshest weather (-20 to 60 ). The ultra-low-power design and A23 alkaline battery can last up to 3 years. Easy To Install & Guaranteed ConfidenceSimply plug the receiver into a power outlet, Push buttons can be fixed to the doorframe with screws or attached it on wall with double-sided adhesive tapes, the install accessories included. Besides,Our wireless doorbell are CE,RoHS,FCC Certified.We are committed to serving customers with reliable quality products,please contact we via Contact Seller to get a perfect solution to any problem.