Pet-Remote works in combination with a free app for iOS, android and windows phone and communicates with Bluetooth smart. Pet-Remote is no shock-collar - it definitely won"t hurt your beloved dog! we simply use vibration which your dog can feel and react to it. Pet-Remote offers a new and easy way to communicate with your dog! you can choose whether to use vibration and/or acoustic signals. The consistency of the signals helps your dog to understand and fulfill your expectations. Your dog will thank you for your clarity. Have fun! due to the vibrating collar your dog knows exactly what you want him to do. This makes it also easy for other people like your dog sitter to control your dog and you don"t have to worry. You can tell your dog to do standard commands or advanced tricks. Pet remote is a gentle and dog-friendly way to communicate. You and your dog will love it! lithium polymer battery.