Swimming Pool Alarm has filed an appearance patent (patent No.:2007301307785).and its has passed CE, ROHS certifications. Some parts have passed FCC, TUV certification . when the detector of extension installed by the swimming pool detects the waves generated by object of heavier than 6kg falling into water within a range of 6m, it will immediately alarm and send RF, send the wireless signal that it detected to other extensions of the swimming pool and indoor host simultaneously. Alarm of indoor host: 30cm distance, volume: 90DB or so, red LED display and alarm; alarm of outdoor extension: 1m distance, volume: 90DB or higher, 3 red LED display and alarm. Emergency occurs can send out alarm within 8-12 seconds.