8MB USB-Charged MP3 Playback Box

Ultra-portable MP3 sound module with 8MB embedded memory (~8 minutes total playback time, based on 1MB per minute). Physical size: 4.5 × 3.2 × 1.2 cm; weight: 18g. Durable ABS enclosure. Powered by integrated 3.6V rechargeable button lithium battery, charged exclusively via MICRO-USB. Visual feedback provided by two dedicated LEDs: charging LED stays lit until full, playback LED illuminates during audio output. Volume dial enables real-time adjustment. MP3 files loaded directly from PC or Mac using standard USB file transfer — no formatting, partitioning or special utilities needed. Supports multiple audio files stored in root directory; playback advances to next file on each trigger event. Compatible with common USB host controllers and widely adopted in education kits, smart packaging, and assistive devices across the UK market.