Thank you for viewing our product! Audio-Technica SOLID BASS Heavy Bass Wireless Earphones Champagne Gold ATH-CKS550XBT CG [Product Overview] Product certified with the Technical Regulations Compliance Mark (Frequency band: 2.4GHz band) φ9.8mm SOLID BASS HD driver with excellent transient characteristics that reproduces sharp, heavy bass Large-diameter sound conduit improves sound transmission efficiency, providing wide-range playback from low to mid-high frequencies Wireless cable style that is easy to handle whether in front of the body or behind the neck Small body achieves both high sealing and wearing comfort 7 hours of continuous playback (charging time: approximately 3 hours) Audio-Technica Model Name...ATH-CKS550XBT