1. Small, light, easy for carrying and handling; 2. Builtin Li_ion rechargeable battery by connecting USB power cable to PC,longtime operating time(Can operate 15 hours with fully charged battery); 3. Audio and visual alarm,sensor-off alarm, alarm limit can be set; 4. Automatic Power-off within 3 minutes; 5. Battery capacity indicator. Applications: Pulse Oximeter can be applied in the hospital's operation room, ICU, clinic section office, Out-patient department, sickroom and emergency treatment. Dimension:120x63x23mm Net Weight: 190g Gross Weight: 750g Package Size: 210x155x60mm Color: White and Black