1. Port: USB 2.0 or USB 3.0, compatible with USB 1.1 and USB 1.1 2. Gold plating for USB pins 3. Material: zinc alloy + diamond 4. Shape: customization as per your drawings or ideas are highly welcomed 5. Factory Price Jewlery Heart Shape USB 2.0 Flash Drive, Necklace USB Drive 6. Capacity: 512MB-128GB, 100% true capacity 7. Memory brand: Samsung, Toshiba and SanDisk, or as per your request 8. Data Retention: at least 5 years 9. Password protection and optional auto-run function 10. Plug-and-Play function, no need of any extra power supply 11. Operating Temperature: 14 to 131 ℉ (or -10 to 55 ℃) 12. Storage temperature: -4 to 131 ℉ (or -20 to 55 ℃) 13. Writing speed: 4.5MB/s for USB 2.0, 10MB/s for USB 3.0 14. Reading speed: 10MB/s for USB 2.0, 35MB/s for USB 3.0 15. Operating Humidity: 20% -90% 16. Storage Humidity: 20% -93% 17. Logo printing or engraving is highly welcomed 18. Various packing is available, from white box, black box, aluminum box, to window box, or as per your request 19. RoHS compliance