1. Vivo XPlay 3S
2. Funtouch OS 2.0 (Based on 4.4.2 KitKat)
3. ES9018K2M DAC + OPA2604 Amplifier
refers to this http://www.esstech.com/index.php/en/products/sabre-digital-analog-converters/sabre-hifi-mobile-dacs/sabre-hifi-stereo-dacs/es9018k2m/
thank you before