Specification:100% Brand new and high qualityUnique cordless design is continually applied with the modern element150m 4D remote control is easy to equip and you can enjoy the music from AITON in your space No wiring required, easy to fit and installAdopt wireless system with super-long receiving distanceAnti-interference design to avoid the mutual disturbs Effective range up to 150 metersEnvironmental friendly design Model: V006cPower supply: BatteryDoorbell Size: Approx.8.5*8.5*3.0cm(L*W*H)Remote Control Size: Approx.9.5*6.3*2.8cm(L*W*H)Note:1. Please use the good quality alkaline battery fir AITON doorbells. 2. Don't install the product in sunny or rainy place3. Please keep some distance between this product and the metal when you install in case it affects the usage4. The sender and the receiver use the same codes to match with each other. Please check whether the computer barcodes on the shells are the same or not.Package Includes:1 x Wireless Doorbell1 x Remote Control4 x Screws