1.Advantages of using photovoltaic energy supply modules in ETC：
（1）It can be charged by indoor lighting and outdoor sunlight. Where there is light, there is electricity.
（2）Reduce the cost of replacing the battery and reduce the frequency of replacement, reduce environmental pollution, and help energy conservation and environmental protection.
（3）Effectively compensate the microampere current after the product sleeps, prolong battery life, or prolong the use time of charging equipment.
（4）Increase product innovation highlights, enhance product market competitiveness, and improve product use value.
2.ETC's low-light solar cell specifications, size (length * width * thickness) and electrical performance parameters (open voltage, short current and working pressure, etc.)：
Low light solar cell model | size(mm) | Section number | Open circuit Voltage（V） | short circuit current(uA/mA) | Operating Voltage(V) |
SC2237I-9A | 37.0*21.8*1.1 | 9 | 4.5 | 11.6uA | 3.6 |
SC2540I-9 | 39.4*24.5*1.1 | 9 | 4.5 | 11.6uA | 3.6 |
SC5522S-8T | 54.7*21.7*2.2 | 8 | 4.8 | 10.0mA | 3.6 |
SC4820S-8N | 47.6*19.6*3.2 | 8 | 4.8 | 7.0mA | 4.2 |
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