The Sennheiser BT T100 is a classic Bluetooth audio transmitter for headphones and speakers. It does not transmit a signal that can be received directly by medical hearing aids such as the Phonak Virto I90-R. To bring TV sound directly into the hearing aids, you need a streaming accessory that is compatible with your hearing aid (e.g. Phonak TV Connector) or a system that supports Bluetooth LE Audio / Auracast, BT T100 cannot do this.