500 W Amplifier; supports Real-Time and scheduled Tasks, Resume Play and Audio Material Library Management, supports Alarm Input, Arming Schedule and Audio Linkage, supports TTS Speech Synthesis and Text Broadcasting with natural and smooth Standard Male and Female Dual Audio Options, supports multiple Types of Audio Source Input: Bluetooth, USB Flash Drive, Microphone and RCA, with flexible and convenient Operation, independent Microphone Volume control, 2-Channel Partition Volume Control, supports 2-Channel Audio Mixing Output, supports ISUP, EZVIZ Cloud and ISAPI Protocol, adopts High-Strength Engineering Plastics, sturdy and durable, integrated Functional Design, convenient and reliable.