Lenovo vibe k4 note is a value for money smartphone with advanced features, good screen quality and protection.
Sound in earphone ( not provided by lenovo) is great. Quality and volume of external speakers are too much good.
Everything in this phone is great except some minor points.
1) back panel is fingerprint magnet. You have to wipe it frequently otherwise it looks bad.
2) Earphones are not given in the box. You have to purchase it.
3) Processor is ok ok.
Conclusion: In this price phone is great. Highly recommended.