Brand: RadioShack. MPN: 273-1047. *This plug mates with Enercell and RadioShack branded DC and AC adapters allowing end user to select the best tip for their device and select the proper polarity. *With the help of the Adaptaplug series you can plug your AC or DC powered electronics (wireless phone mp3 player etc.) directly into a standard socket. Check your device for plug size. *Adaptaplug F conversion size: 1/8 (3.5mm) mini plug.