The JBL Live Flex 4's 12mm drivers, combined with JBL's signature sound, deliver crisp detail, deep bass, and a naturally balanced sound. JBL Spatial Sound makes you feel like you're at a concert, as the sound seems to come from almost anywhere around you. This is the best possible representation of JBL's signature sound. ~ Support Android and iOS (Whatsapp and Wechat message notifications) Bluetooth 6.0 Dynamic Frequency Response Range (Hz): 20Hz – 40kHz Bluetooth music play time: Up to 10 hrs (ANC off) Net weight: 9.0g per pc (Earbud), 67.1g (charging case) Accessories Included: Earbud x1pair, Charging case x1pc DJBLLIVEFLEX4BLK DJBLLIVEFLEX4BLU DJBLLIVEFLEX4CPG DJBLLIVEFLEX4SIL ~ • Return and refund are not accept. • Free shipping to HK/Macau when spending over $500 onwards • China area shipping fee $130 + Local SF Express • Three business day shipping. Sent via SF express / JD Logistics. • Exchange of defective units purchased in 7 days ~ *Photo for reference only