Acer Liquid Z520 8GB Dual SIM - Factory Unlocked Phone - Retail Packaging (Black) A 5-inch display combines with our Reading Mode filter for great visuals that protect your eyes, while a 1.3 GHZ quad-core processor provides zippy overall performance. With a full range of voice-activated camera commands, your options for personalizing your vision expand. The certified DTS Studio Sound drops you right into it, with a wider, more detailed sound, and yeah, your buds will burst with even better boom.