MP3 Module: 1. Supports sample rates: 8,11.025,12,16,22.05,24,32,44.1,48 KHZ 2. fully supports the FAT16 / FAT32 file system, maximum support 16G tf card 3. for DC 5V 1A Power, with two sets of interfaces 4. Volume adjustment 5. low trigger on trigger. 6. Support 0-2W, 4-8 speaker load 7. with a standard 3.5 audio interface, support for audio, effect connection. Speaker Specifications: Within the magnetic small speakers: 0.5W 8R Trigger a for play once 9 trigger port, direct triggering Play Combined MCU IO port 31 to for play MP3 encoded hair Internal amplifier with 3W to meet most applications Numerous basis, without programming, simple operation Applications: 1. MCU voice broadcast application 2. factory, warehouse, corridor safety warning 3. for Smart car, electronic design applications 4. The electrical and mechanical equipment, electronic applications early warning alarm warnings 5. Advertising, automatic broadcast, regular broadcast news 6. Device before doing voice guidance, voice warning Specifications: Board Size: 4x3.8cm/1.57x1.5" Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! No Retail Package Package Includes: 1 x MP3 Voice Module