Ferguson Smart Whistle is a personal safety device that can be used to send emergency notifications to your contacts in case of an emergency. It uses Bluetooth 4.0 technology to connect to your smartphone and has a range of 5-6 meters. Once paired, the app will notify you that WISO is connected. You can then customize your WISO profile name, add contacts to whom you want to send emergency SMS or emails, and add a contact to whom you want to make an emergency call (Android users only). The device also has an emergency button that you can press to activate emergency notifications.