Among manufacturers of POS terminals, Vanstone ranked 19th largest based on units shipped in 2016. It shipped more than 409,000 terminals last year, up 30% over 2015. The company’s newest device, the Aisino A90 (shown here), uses a customized Android 5.1 operating system and Qualcomm quad-core ARM. The A90 supports EMV-compliant NFC and QR code-based mobile payments. It offers a 5.5-inch high-definition touchscreen for customer-facing transactions. The 6000mAh rechargeable lithium battery can handle 700 transactions or 10 days screen out standby. The A90 is configured with dual cameras on th...