The BH4453F-E2 manufactured by ROHM is an audio amplifier CD player headphone amplifier integrated circuit. It comes in an 8-pin small outline package (SOP), and is designed for portable audio player applications. The amplifier features a low supply voltage (-4.5V to -5.5V) and high output power (+9dBV), plus a low noise level (-72dBV). It also features built-in mute, tone controls and volume control functions, so it can be used to create a high-quality audio signal with minimal external components. It is a very efficient device, requiring only a minimal amount of power and space, making it ideal for portable audio applications.