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Bluetooth Helmet Car Charger for Viper Helmet - RS-V121- RS-V99 - RS-101 : Amazon.co.uk: Electronics & Photo. Bluetooth Instructions manuals DOWNLOAD · VIPER BL+ Helmets · VIPER RSV171 3.0 · Company · Information · Dealer Search · Newsletter Signup. Viper Bluetooth® Stereo headset user guide. Viper Bluetooth® Introduction Plug in the charger to the helmet and fully charge the helmet for 4 hours. Could any one please give me some info on a Viper RS v121 bluetooth helmet setup. I have a neigbour who has bought two second hand helmets and he and his