SUPERB SOUND QUALITY IN TERMS OF BLUETOOTH - With a team of highly skilled audio engineers, developers of ACIL dedicate to finding the perfect frequency balance in these wireless earbuds! Knowles balanced armature driver is adopted for high frequency, delivering clear and brilliant treble. Dynamic driver operates in mid-low frequency, delivering lush and rich bass. Two types of unit are combined together to complement each other which provides superb sound quality even compared to AKG K3003! PREMIUM MATERIAL & EXCELLENT BUILD QUALITY - These well made Bluetooth earbuds adopt soft touch matte plastic and liquid silicone material, would not feel like other budget earphones. By embracing asymmetrical and ergonomic design, ACIL wireless earbuds fit comfortably in your ears. 4 pairs of flexible liquid silicone earpieces of different size come with these In-ear headphones which brings softness and comfort. Immerse yourself in the music world! POWERFUL BATTERY & SMART OPERATION - With the innovation of battery, you can use these wireless earphones up to 11 hours on a single charge. The charging takes only 2 hours to full charge which is a bit faster than usual. By pressing the MFB in different way, you can fully control your recreation. Play or pause, reject or answer, transfer voice and connect Bluetooth, all the operations are at your fingers. There is no doubt that ACIL are smart wireless earbuds you should never miss!