Free Shipping Mini Portable 4GB USB Voice Recorder USB Flash Driver U Disk-Silver & Black 1pcs for $13.46 - Aliexpress Specification: Memory Capacity: 4GB Interface: USB Recording Format: WAV Recording Bit Rate: 192 bps Recording Time: 48 hours Supporting System: Windows 2000/ XP/ VISTA/ 7 Battery Charging Time: Connect the USB cable to PC or adapter USB port, normally, the charging time is around 3 hours Color: Silver & Black Click on the link to visit product page