Feature: 1.4.1 intelligent high-profile chip makes all mobile phones accept better, faster transmission speed, optimized call performance, faster link speed, and more comprehensive. 2.The stereo high-definition sound quality supports one earphone and connects two mobile devices at the same time. 3.The product is equipped with a 50mAh rechargeable lithium battery, providing long standby time. 4.CVC6.0 noise reduction technology makes clear calls. High range and bass are controlled, attaching great importance to the tuning. 5.One simple Home key to complete a variety of functions, including on/off, answering calls, music playback, etc. 6.This earphone would be compatible with most mainstream digital devices, tablet/computer/mobile phone and other digital equipment. 7.Light and small, easy to carry. Great for gym, running, jogging, hiking, cycling, and impact sports.Specification: Item Type: Earphone Bluetooth Version: V4.1 Drive Unit: 10 mm Speaker Impedance: 1615% Sensitivity: 110db Distortion: below 0.3% Noise Reduction Technology: CVC 6.0 Frequency Response: 20-20khz Battery: 50mAh lithium battery Color: Black/White/Gold/Rose Gold (Optional) Size: 28x16x15mmNote: 1.Please allow slight differences due to manual measurement. 2.Please allow slight color differences due to different light and screen.Package Included: 1 x Earphone 1 x USB Charging Cable 1 x User Manual