Cannot Connect - Yeelight Color Bulb

Dear Every one,

I live in United States.
I purchased 2 yee color light bulbs.
I think they are 220 V 50Hz from gear best
I cannot connect to WiFi network.
I am wondering not able to connect is it secondary to the voltage ?
If I purchase a step up transformer for my connection will the yee light bulbs work ?

please let me know

I think a voltage transformer with output 220v 60Hz is workable.