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Step Up and Step Down Voltage Transformers - $30 (Harvard Square)
condition:
excellent
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I have one ST-3000A transformer, 5 V USB, 230 V, and 110 V. $40 cash.
All three have multiple style plug sockets.
The transformers are pluggable to either a 110v or 220v outlet by changing a switch on the backs.
All are in excellent condition and were used for a short time period.