Comes with lanyard and carrying pouch!

Display Range: SpO2 35% to 99%, Pulse Rate 25 to 250 bpm, Perfusion Index 0.2% - 20%, Accuracy (% SpO2) 75% - 99% ± 2%/50% - 75% ± 3% Pulse Rate Accuracy: 25 to 250 bpm ±2bpm Perfusion Index: 0.2% - 2% ± 0.1%/2% - 10% ± 1%/10% - 20% ± 2% Alarms: Audible and visual alarms for Low Battery, Low SpO2, High Pulse Rate, Low Pulse Rate Pre-set Alarm Limits: Low SpO2 90%, Low Pulse Rate 50bpm, High Pulse Rate 120bpm Resistance to surrounding light: The difference between the values measured in the condition of indoor natural light and that of a darkroom is less than ± 1%. Dimensions and Weights: Size 2.59" x 1.42" x 1.3" (66 mm x 36 mm x 33 mm), Weight 60g (including batteries) Power Supply Requirement: Two (2) 1.5V AAA alkaline batteries (included) Environmental Requirements (Operation): Temperature 41°F ~104°F (5°C ~40°C) Relative humidity 30%~80% Atmospheric pressure 10.15 psi~15.37 psi (70kPa~106kPa) Environmental Requirements (Storage): Temperature -4°F to 131°F (-20ºC to 55ºC) Relative humidity < 95%