Security alarm system Safety angel is a security alarm system, home alarm system, electronic siren system, water alarm system, child baby safety alarm system. Safe and reliable, meeting the testing certificates of nf p90-307/a1 and astm f 2208-08. It consists of two parts, base unit (for parents) and wrist bracelet (for children). Including three functions: 1. Anti-drowning alarm: when the wrist bracelet is immersed into the water, the base unit will sound alarm and vibrate immediately. 2. Anti-lost alarm: when the wrist bracelet is leaving a presettable distance (0-50m), the base unit will sound alarm and vibrate immediately. 3. Personal alarm: when parents meet an emergency, they can fast press help button to alert people around to ask help, like a sos. Welcome to order this swimming pool safety angel child anti-drowning combined anti-lost alarm. Display color box