1. Digital Technology, 2. Alarm with freely set limit. 3. Accurate measurement during low perfusion 4. Anti-Movement, Stable Performance 5. Built-in rechargeable battery and seat-type charger; Power-Saved Function 6. Built-in memory card for data memory; connection with computer for downloading data 7. Bright, Easy-to-Read LED Numerals 8. Lightweight, Portable 2 parameters: SPO2 + Pulse Rate