Nintendo has confirmed to GamesIndustry.biz that only those that first purchase Wii Speak will be able to use the peripheral and the associated Wii Speak Channel.
The units comes with a one-time activation code that will not be replaced, effectively killing any second hand sales of the peripheral.
Only those with Wii Speak will be able to access the Wii Speak Channel, which does not function without a Wii Speak unit.
Wii Speak goes on sale in the UK on December 5 and is priced at GBP 25.