Here are the main features and details of a hand-held pulse oximeter:

1. Display: Most hand-held oximeters have a digital display that shows the oxygen saturation percentage, heart rate, and often a plethysmographic waveform.
2. Probe/Sensor: The device typically comes with a detachable probe or sensor, which is clipped onto a thin part of the patient’s body, usually a fingertip or earlobe. Some models offer various probes suitable for different patient sizes or body locations.
3. Power Source: Hand-held pulse oximeters are commonly battery-powered, making them portable. Some also have an option for AC power.
4. Portability: Although larger than fingertip models, hand-held pulse oximeters are still portable and are often used in clinical settings where continuous monitoring or frequent checks are needed.
5. Alarms: Many hand-held models come with adjustable alarms that sound when the oxygen saturation or heart rate goes beyond or below set limits.
6. Storage and Data Transfer: Some advanced hand-held pulse oximeters can store data, which can later be transferred to a computer for further analysis.
7. Durability: Hand-held models are often more robust and durable than fingertip models due to their construction and intended use in clinical settings.
8. Battery Life: Depending on the model, the battery life of a hand-held pulse oximeter can vary. Many have a long battery life suitable for continuous monitoring over several hours or even days.
9. Accuracy: Most pulse oximeters are accurate within 2% for oxygen saturation levels between 70% and 100%. However, accuracy can be affected by factors like poor circulation, nail polish, ambient light, or movement.