Oticon Hearing Aid Dealers Oticon BTE "Dynamo SP4" is entry-level Super Power hearing aid. It boats their highest output ever from a BTE13 device (143 dB SPL) to help individuals who have even severe-to-profound hearing losses. It includes an automatic directional microphone, noise reduction technology and Speech Rescue (designed to improve access to high-frequency speech sounds). It includes both a volume control (dial) and a program button.