Specifications of the portable hand-held adult oxygen measurement device with charger SP-20: The SP-20 device for oxygen testing with a simple design and a unified global reading system. The SP-20 device measures blood oxygen level and heart rate, and is ideal for cases requiring continuous monitoring. The SP-20 features a color LCD screen that supports numbers and displays continuous test results of blood oxygen level and heart rate. The SP-20 screen is equipped with easy-to-use control buttons. The SP-20 screen can display data horizontally when the device is placed horizontally, based on the integrated arm at the back of the device. The device is compatible with many sensors such as finger clip, ear clip, head strap, and others. The SP-20 operates on a long-lasting rechargeable internal battery. The oxygen measurement device can be charged directly via a Micro USB cable, or through a Micro USB cable with a charging dock by placing the SP-20 on the dock. The oxygen measurement device works for 18 continuous hours when its battery is fully charged. The device settings can be adjusted to send alerts when heart rate exceeds the upper or lower limit, and when the oxygen level drops below the minimum. The device supports multiple users and accepts 16 accounts. It stores up to 580 hours of data. The SP-20 oxygen testing device is capable of sending visual and audio alerts. Included with the SP-20 device: Finger sensor clip suitable for adults weighing 30 kg and above. Device dimensions: 15.8×7.3×2.5 cm. Device weight: 230 grams.