[S9 with Innovative exclusive intelligent charging compartment] The ear-buds start charging when the charging compartment cover closed, and the charging compartment is also charged while charging. S9 can be used for 6 hours in a single full charge, the charging box can charge the ear-buds fully in 3-4 times, 6*4=24 hours of continuous sound music, 6*4=24 hours of talk time, 100 hours of standby time and 1H Fast charging allows you listen continues. [Bluetooth 5.0 and unique stereo bass] The Bluetooth transmission communication speed can reach 48MBps the stronger anti-interference performance, the more stable connection is, and can be controlled from a 15-meter distance. Never worry about cutting off during listening and controlling, making music playback and conversations smoother and clearer. The unique stereo sound quality design gives perfect sound quality, and realize the true music. [ Mini ergonomic design and IPX5 protection] Coolest CD textured surface ear-buds button, mini invisible in-ear design, comfortable and soft ear-buds sleeves, true wireless frees your hands, under IPX5 protection, you can enjoy Listening in the rain, Very convenient fit. Equipped with a metallic charging station, it is a small and stylish pocket-sized charging compartment, and it can be carried with you in one hand, allowing you to realize the real walk-and-go. [High-end metal charging compartment with patented independent power management technology] Aluminium alloy charging compartment, This exclusive patented independent power management technology enables The charging compartment can separately control the charging of the left and right earphones separately, place the L&R earphone into the Charging Station, One Red LED indicates the earphone No power, One blue LED indicates the ear-bud charged fully, The ear-buds will charge automatically . [Mono and binaural mode] Two earbuds can be used alone or in two channels. Each earphone can be paired independently. Both “L” and “R” can control “play/pause/previous/next song / Volume Plus / Volume Down / Answer / End / Reject Call”, it's like you have two completely separate headphones. Functionally, you can connect to the same device to share music with your friends or use two headphones to enjoy stereo surround sound.