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 Replace 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) 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 Mode, The Background Music Is Stored In The Root Directory, And The Insertion Music Must Be Placed In The "CHABO" Folder size: 7.59 x 5.81cm Material: PCB colour: black Package Contents: 1 x MP3 Player Module 1 x Data Cable 1 x Screwdriver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.