Features: DY-SV20F is a 1-to-1 segmented triggering control player that supports MP3 and WAV decoding formats. 9-way 1-on-1 triggering interface, can triggering up to 9 tracks. Low level triggering (triggering interface S1toS9 is shorted to GNDs). DC3.7-5V wide-voltage power supply, direct drive 4-8 speaker, power output up to 5W. On board 32Mbit (4MByte) flash storage, connected to a computer via USB data cable to replace audional files. It supports external volume Potentiometer to adjust the volume, and can set 8 triggering working modes, suitable for many scene applications. Specifications: Material: Printed Circuit board Size: Approx. 30x23mm/1.18x0.91inch Working-voltage: 3.7-5VDC wide-voltage power supply Data Format: MP3, WAV Note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution. Package includes: 1x Voice Playback Control Module