The CMF Buds have a depth of 42 dB and a bandwidth of up to 2900 Hz, blocking out unwanted noise. An external high-definition microphone detects ambient noise, and then the internal processor generates a reverse sound wave to emit silence through the speaker. ~ Support Android and iOS (Whatsapp and Wechat message notifications) Playtime (Single/With Case): 6.5H/26H Fast Charging: 10Min = 3 Hours (buds only), 7 Hours (with case) Driver: 11 mm bass driver, 6 mm micro-planar tweeter Weight: 4.9 g (Per Earbud), 46.0 g (Charging Case) Accessories Included: Earbuds x1pair, Charging Case x1pc, ear tips (S/M/L) x@1pair B195 ~ • Return and refund are not accept. • Free shipping to HK/Macau when spending over $500 onwards • China area shipping fee $130 + Local SF Express • Two business day shipping. Sent via SF express / JD Logistics. • Exchange of defective units purchased in 7 days ~ *Photo for reference only