A portable and effective personal drowning detection system. Your iPhone/iPad/iPod Touch* alerts you if a swimmer remains submerged for too long, or if a toddler enters the water without your knowledge or close supervision. Comfortable, lightweight headband can also be used as a goggle strap. Tamper-free wristband fits most toddlers or attaches to pet collars. Monitors up to 8 iSwimbands per iOS device and is expandable. Range up to 100 foot/ 33 meters (will depend on environmental conditions). Compatible with Apple iOS7* and greater. Includes free companion iSwimband app with auto-updates via Apple's App Store. Developed with the guidance of leading aquatic safety expert. One-time setup takes only a few minutes. Works along with goggles and swim caps.