The rest of this Android 4.1.2 phone is a bit of a mix: there's a 4.5-inch 960 x 540 display, a quad-core 1.2GHz processor, 1GB RAM, an 8-megapixel main camera (so not UltraPixel), a 1.6-megapixel front-facing camera, WCDMA radio and microSD expansion.

ENGADGET

The rest of the Vivo X1, however, is more bog-standard in comparison: MediaTek MT6577T processor (1.2GHz, dual core, Cortex-A9), 4.7-inch 960 x 540 IPS display, 1GB RAM, 16GB built-in storage, eight-megapixel main camera, 1.3-megapixel front-facing camera and WCDMA 2100 3G radio.

ENGADGET: BBK's Vivo X1 is a phone for audiophiles, packs high-end DAC and Beyerdynamic earphones