◆Waterproof, the grade is IPX7. (Can be put into 3.3ft (1.0m) deep water.) ◆Has calendar, clock and alarm clock function. Rechargeable battery, super standby time (about 5 days). ◆Can download the registration information by charged software, makes the registration easier. ◆OLED screen, thinner, lighter and more flexible anti-seismic and knock. ◆Can register 500 numbers at most ◆Prompt: vibration only ◆Screen Size:1.9*1.0*0.6 in (48*25*15mm) ◆Use a charger