I have used many earphone which keeps on falling from my ear and fits to others. Sometime I started to feel that my ear design may be unique. When I tried this Zoook ZM-EM21 Earphone, I got shock as it fits perfectly due to unique ear hook design! I tried playing music on my Samsung A3 smartphone and I can hear amazing music quality with very good bass from it. But when I tried this earphone on my iball compbook laptop, left side earphone hearing volume was very lower than right side one. Other than that, I liked the audio quality and design. Please check the pictures and video of Zoook ZM-EM21 Earphone attached with this review. Click that YES if this review was helpful to you in anyway.