Lenovo vibe k4 note is best in average price phones.
specifications:- 13.9cm(5.5inch) full HD display dual front speakers supporting DOLBY ATMOS unique 3-mic audio input system ANDROID LOLLIPOP VERSION but it can update in MARSHMALLOW MediaTek MT6753 64-bit processor 1920 to 1080 IPS resolution 3GB RAM 16 GB internal storage and up to 128 GB microSD rear camera 13MP PDAF auto-focus w/dual led flash 5MP fixed focus font camera dualMicro sim with 4G LTE support 3300mAh battery
if u wanna to know how its work, so im telling u its work great and battery backup is good.its has 100-240V - 50/60Hz 0.3 input and 5.2V - 2.0A output in ac adapter so its charge ur mobile fast instead other charger.i know these things becoz I recently buy it.