... frequency, high promotion ability.4. Waterproof and shock proof, with long life time. Specifications: Brand Chuangixnjia modeCXJ-USB01Printing Offset ... Celebration, meeting gift,business gift, fair gift, etc Advantage with groove design on the front side, easy to open ... CXJ01 USB business card--- open mode USB business card with metal case packge CXJ01 USB business card without printing USB business ...