AXIS C1310-E Mk II is an all-in-one unit with built-in power amplifier and signal processing (DSP). Pre-configured digital signal processing produces clear, understandable voice every time. Onboard memory supports pre-recorded voice messages. Or, security personal can respond to notifications or provide instructions with live speak. AXIS C1310-E Mk II also has a built-in microphone for remote health testing so you always know its working.