Detailed information about VSpeak for Spektrum can be found in detailed manual.
For the operation of the speech module "VSpeak for Spektrum" the Spektrum VSpeak Adapter is required. Since there is no connector for "Spektrum VSpeak adapter" inside the radio, some wires have to be soldered to the RF module.
Attention: The necessary modifications of the radio will void your warranty !
English Forums on topic: Using the VSpeak Speech module
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Link to the homepage of the radio system: www.spektrumrc.com