1,RFID Attendance management system 2,Waterproof &Durable 3,USB Communication 4,10 meters free ... hard anodized coat,10 meters free fall without damage.Suitable used in harsh environment.2,Storage:60,000 records3,USB Communication ... hard anodized coat,10 meters free fall without damage.Suitable used in harsh environment.Storage Capacity16M,60,000 recordingsCommunicationUSB Battery3.6V ...