Features: Multifunctional on-cord control: support volume adjustment, song switch, calls control. Bluetooth 4.1 technology: provides the quick and stable sound transmission. Lightweight: only 6.5g, just like wearing nothing. Built-in mic for hands-free calls. CVC noise canceling for high-definition calls and music. Support connect with two devices simultaneously. Come with 3 pairs earbud tips, meets different people's needs. Specifications: Brand: Xiaomi  Model: LYEJ02LM  Color: Black,White  Material: ABS  Type: In-Ear  Wearing type: In-Ear Charging Time.: 2 hours  Compatible with: Mobile phone  Connecting interface: Micro USB  Connectivity: Wireless  Frequency response: 20Hz - 40KHz  Driver type: Dynamic  Impedance: 32ohms  Music Time: 3 hours  Sensitivity: 98 dB (S.P.L at 1KHz)  Standby time: 70 - 100 hours  Talk time: 3 hours Bluetooth chip: CSR8610  Bluetooth distance: W/O obstacles 10m  Bluetooth mode: Hands free  Bluetooth protocol: A2DP,AVRCP,HFP,HSP  Bluetooth Version: V4.1 Battery Information Battery Capacity(mAh): 50mAh Li-ion battery size (L x W x H): 5.60 x 1.00 x 0.80 cm / 2.2 x 0.39 x 0.31 inches  weight:6 g Function: Answering Phone,Bluetooth,Microphone,Multi connection function,Song Switching,Voice control  Notes: 1. There may be slight size deviations due to manual measurement, different measuring methods and tools.  2. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor. Included: 1 x Bluetooth Earphone 3 x Ear Muffs 1 x Charger Wire 1 x Manual 1 x Guaranty Certification