ASUS ZenFone™ Selfie (ZD551KL)

With dual front and rear facing 13-megapixel cameras, dual flash real tone LED, and 0.2 seconds ultra fast auto-focus, the ZenFone™ Selfie sports impressive camera credentials. Running on the ASUS ZenUI™ interface, quick access to the powerful front facing camera can be achieved with a quick swipe of the screen. Powered by a Qualcomm® Snapdragon™ 615, the device also supports the aptX™ encoder to allow superior quality Bluetooth® audio streaming with compatible devices.


Key aptX™ Features

Consistent audio quality

Fixed compression ratio ensures consistency

Full spectrum of sound

From 20Hz to 20kHz, aptX audio covers the human hearing range

Interoperability testing program

We operate rigorous testing for all aptX enabled products, so you can be confident all products will deliver the same audio quality

aptX™ Tech Specifications

Sound quality
  • THD+N@1kHz: -67dB
  • SNR@1kHz:  93dB
  • PEAQ audio quality:-0.18
  • Qualcomm® Kalimba™ MHz DSP technology: 42MHz@48KHz stereo decode ~45MHz@48KHz stereo encode
Audio Encoding
  • 16-bit, up to 48kHz sampling rate
Program memory usage
  • 3.3kwords (encoder) / 3.6kwords (decoder) 
Data memory usage
  • 1.8kwords
  • ~63MHz (stereo encode) on ARMv7A with NEON 
Bit Rate
  • 384 kbps (48 kHz sampling)