The World's Thinnest and Lightest Behind-the-Ear Audio Processor Easy-to-Use Modular Design Easily Connect with other Audio Devices Proven Performance for Everyday Life The OPUS 2 is the ideal choice for children and adults. It is the world's thinnest and lightest behind-the-ear (BTE) audio processor, making it especially suitable for little ears and all ears. The right fit for your active lifestyle with multiple wearing options, colours and optional assistive listening devices.