Pulse Oximeter Features:
1. Accurate and reliable
Accurately determine your SpO2 (blood oxygen saturation levels), pulse rate and pulse strength in 10 seconds and display it conveniently on a large digital LED display.
2. Full SPO2 value
The ONLY LED pulse oximeter that can read and display up to 100% for SpO2.
3. Health care
For sports enthusiasts like mountain climbers, skiers, bikers or anyone interested in measuring their SpO2 and pulse rate. SpO2 and Pulse Rate now faces instead of away from the user for an easy read.
4. Finger size
Finger chamber with SMART Spring System. Works for ages 12 and above.
4. Include 2X AAA BATTERIES that will allow the pulse oximeter to be used right out of the box, a SILICON COVER to protect your pulse oximeter from dirt and physical damage and a LANYARD for convenience
Handheld Pulse Oximeter,Blood Oxygen Pulse Oximeter,Portable Pulse Oximeter,Baby Pulse Oximeter Axiswell Technology Co., Ltd , https://www.medhealthycare.com
The so-called de-energization is improved by other technologies. For example, removing some components such as electrolytic capacitors and transformers, the circuit design and the device are simplified to achieve the purpose of reducing the volume, reducing the cost, improving the reliability, and prolonging the life. 
For the industry's rumored "de-powered" will become the trend of the future, Runge Lai Electronics Chairman Wu Jianwei is not optimistic. He pointed out that there are two main manifestations of de-energization from the technical level in the industry: AC-LEDs (AC LEDs) and HV-LEDs (High-voltage LEDs). However, LEDs, as light-emitting diodes, are DC devices. If they are converted to AC-LEDs (AC LEDs), there will be a fatal disadvantage, that is, the voltage is high and the current is low. When the voltage exceeds a certain range, it will burn. Drop the chip.
If HV-LEDs (high-voltage LEDs) are used, that is, by connecting all the chips in series, the voltage will rise. It is also a way of rectifying and adding a constant current device. "There is also a defect in this technology. When your voltage is high or low, its fluctuation has only one relative interval. Once the efficiency exceeds the interval value, the chip will lower the current value. At this time, the light output will be dark and the power consumption will be very large."
In addition, Wu Jianwei also believes that the de-energization technology can not resist large surges, once the voltage is too high, it will directly burn off. "There is a lot of limitations in de-energizing. If it is used in a small power range, the problem is not too big. If it is used in outdoor lighting, such as mining lamps, floodlights, street lamps, the regulation of large currents by power supply is uncertain. of".
Therefore, in his view, de-energization must be used in places where the voltage is relatively stable, such as urban business buildings, office buildings, etc., and in remote mountainous areas, where voltage is unstable, it is not suitable for de-energizing technology. .
“Currently, including many IC suppliers, they are also looking for a way to de-power. I want to find a way to integrate ICs into it. Maybe going to power the future will be a trend, but this trend is not likely to occupy an absolute The mainstream, only one more way to develop." Wu Jianwei concluded. 
Wu Jianwei: Going to power will not become mainstream
[Text|High-tech LED reporter Gan Qin] is known as the LED "heart" drive power, has been considered as the short board of LED lamps, and the short circuit of the drive power is in the electrolytic capacitor, in order to solve the problem caused by the capacitor, The technology of “de-powering†came into being.