Doberman combines it's two most innovative and unique Active items in its Power Combo. The Doberman Power Button and the Doberman React Whistle offer comprehensive security for your active lifestyle. Take the Power Button on your daily workout routine. Put the React Whistle in your purse or strap it to your bag. Whether it's your child walking to the bus stop alone or the active person who can only find time in the evenings to take that daily jog, no matter where you go, the Doberman Power Combo products are at your side. more info