This is a micro-power(only 150MA) DC-DC Step-Down & Step-Up Converter module.
Weight : about 0.5g(Very very light)
This is a DC-DC voltage converter module,Must be noted when using:
1 Input voltage can not be greater than the maximum input range
2 Output power can not be greater than the maximum load for a long time
3 Input power must be greater than the output power, because the power consumption of the module itself