The Dynavox ESA-18 MK BT is the successor to the highly successful E-SA18 stereo mini amplifier that has been on the market for many years. Compared to its predecessor, the device features a completely redesigned full metal housing with a solid 4 mm front panel, slightly altered dimensions, and Bluetooth reception. The Dynavox ESA-18 MK BT has two line inputs and one microphone input. The microphone input allows for adjustable volume and echo. Additional features include switchable loudness, record out, separate treble and bass controls, and a switchable auto-standby function (the device automatically turns off after approximately 30 minutes without a signal output), completing its extensive range of features.