DC-DC 0.9V-5V to 5V 600mA USB Step Up Power Boost Module PFM Control Mini Mobile Booster
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Excellent Arrived early I haven't tried it yet
Compact size.
Only a nice stuff to try to get 5 v. from a battery of 3,7 v. ... But Usb port may be very useful to charge little devices ...
Super goods, everything was okay, safely packed, fast shipping, highly recommended. With best regards from Germany.
لاؤبالاؤب
Great price
ras fits the description...
Every think ok.
5V power supply from the usb is ok, all received quickly
very fast delivery