It is waterproof, and the waterproof grade is IPX7. (It can be put into 3.3ft (1.0 m) deep water, then it still can work for more than 30 minutes.)
It has calendar, clock and alarm clock function.
With fast delete function, it can delete one registered number or all registered numbers with only one key.
 Downloading the registration information through the serial port, makes the registration easier.
 It can charge in order to avoid the problem of frequent battery replacement, super standby time (about 5 days).
With encryption function, avoiding the information lost by mistake operation