● Equipped with a specially designed φ9.8mm driver that vividly portrays sound details. The diaphragm, with improved linearity (straightness) due to the top-mount PCB, is coated with DLC (Diamond Like Carbon). This improves high-frequency characteristics and reproduces clear, linear sound. ● Up to 12 hours* of continuous playback on a single charge. *Varies depending on usage conditions. With approximately 2 hours of charging, you can enjoy up to 12 hours of music playback. You can use it from your commute to home, and even the next day without charging. ● Neckband Controller Easily control power ON/OFF, music playback/pause, track forward/backward, call answer/end, and volume adjustment from the neckband. ● Includes a magnetic clip to neatly organize the cord. Convenient when not using the headphones, such as when carrying them or storing them in a bag. ● Smartphone voice recognition function Use the operation button to access Siri/Google Assistant. It helps you operate your smartphone and provides daily assistance through the microphone. ● Closed-back design that minimizes sound leakage Reduces sound leakage during listening on trains and buses during your commute. ● Flexible and supple neckband Comfortable to use with a soft-touch, easy-to-wear silicone band that smoothly approaches the ears. Convenient for carrying. Headphone Section: Type: Dynamic Driver: φ9.8mm Output Sound Pressure Level: 103B/mW Frequency Response: 5～35,000Hz Impedance: 16Ω Other: Power Supply: DC3.7V Lithium Polymer Battery (built-in) Charging Time: Approximately 2 hours* Usable Time: Continuous communication (during music playback): Up to approximately 12 hours* Weight: Approximately 26.5g Water Resistance: IPX2 Operating Temperature Range: 5℃～40℃ Accessories: Charging USB cable (30cm, USB Type-A / USB Type-C), Eartips (XS, S, M, L), Pouch Replacement (sold separately): Eartips ER-CKM55XS, S, M, L USB Compatible AC Adapter (sold separately): AD-SU505JEA https://www.audio-technica.co.jp/product/ATH-CKR500BT?srsltid=AfmBOoqoT1pyXpmsTXiZz9IGF8FzHnHfrdNEeMGVao8WA2_-qmyn6huX