Fangrui Product Details Features: 1. 9-24v Wide Voltage Power Supply 9-way One-to-one Trigger Interface, Can Trigger Up To 9 Tracks, High Level Trigger Version, Low Level Trigger Version 2. Supports Mp3 And Wav Decoding Formats, Supports Audio File Sampling Rate Up To 48khz; Can Connect To Computer Via Usb Data Cable To Audio Files, Comes With 64mbit (8mbyte) Flash Storage; 3. Comes With 60w Class D Power Amplifier, Which Can Directly Drive 4-8, 20-60w Speakers 4. An External Warning Light Can Be Connected, And The Voltage Of The Warning Light Must Be Consistent With The Power Supply Voltage; 5. Dip Switch To Set 8 Trigger Working Modes; Volume Potentiometer To Adjust Volume; Optocoupler Isolation (high Level Version) Description: Model: Mp3 Player Module B-h50f Note: 1. After The Dip Switch Is Set, The Power Must Be Re-powered To Enter The Newly Set Mode To Work 2. It Is Recommended To Use The Low-level Version For Mp3 Mode Applications, And S1-s7 Are Valid For Gnd Functions 3. In The Application Of The Insertion M