... & waterproof 4. meets CE, RoHS, NF, ASTM Child Tracker Introduction: This child tracker is a safety electronic device for protectiing children ... detectionQuality Control: 100% tested before shipping Product Usage:Swimming pools, child, the old, garden, park, boat, sea etc.Export ... water including salt pool water.4) Rainproof and water-splash proof.5) Anti-drowning alarm combined anti-lost alarm.6) ...