1. Adopts exquisite ABS plastic enclosure 2. Built-in a high quality MP3 audio decoder. 3. Equipped with a 4MBytes flash memory that supports max. 4 minutes long MP3 files (at 128Kbps). 4. Load MP3 files to the internal flash memory easily through the micro-USB port on computer. 5. Supports 3 types of trigger modes, and each mode can be set through a configuration file. 4 trigger inputs available and to play back 4 sounds one-on-one by negative trigger / negative pulse / GND. Equipped with a 3 speaker with loud sound volume. Adjustable sound volume and wide range power input. Portable design and easy to install. Technical Parameters 1. Working voltage: 6V-30V DC 2. Working Current: 500mA 3. Standby Current: 10mA 4. Power Consumption: less than equal 3W 5. Flash Memory Size: 4MBytes 6. Audio Format: MP3 (32Kbps-192Kbps) 7. SNR: less than equal 100dB Color:Black Material:Plastic+Metal Package Contents: 1 * Audio Speaker 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.