High-quality sound (80 db); comes with 4 tunes</br>Range up to 250 feet</br>Connect up to 4 transmitters simultaneously, such as push button and awareness devices</br>Battery life up to 2 years</br>Portable or wall mount option (included)</br></br>Product Description</br></br>Masters the essentials with style and ease: this portable doorbell is easy to use and even easier to set up, with your choice of 4 tunes. Plus it provides range and clarity you can depend on throughout your home, whether you're in the basement tv room, or enjoying a barbeque on the back deck.</br><br/>http://www.amazon.com/gp/product/B01HN0EMMQ