This Air TWS T03 Wireless Bluetooth Earphones is without the trouble of tangled wires, quite convenient for you to share your favorite sound with your dearest friends or relatives. Come and experience the crystal clear sounds and deep bass. Wireless Design Wireless connection via Bluetooth for wireless charging and no wires between the two earpieces, free you from wires. Quite comfortable to wear. CVC Smart Noise Reduction & Real Stereo Earbud Provides you with fabulous audio enjoyment. Storage & Charging Box Allow to charge during storage. Built-in Mic Easy for clear hands-free communication. Automatic Pairing Once successfully paired for the first time, subsequent pairings are simple. Mini Size & Lightweight Design Easy for storage and carrying with you. Specifications Brand AIR-TWS Model T03 Bluetooth Version 4.1 Supports HSP, HFP, A2DP, AVRCP protocol Frequency Response Range 21Hz-18KHZ Operation Range 10 meters Microphone Built-in high-sensitivity microphone (-38dB) Impedance 16Ω Sensitivity 95dB Degree of Distortion ≤1% SNR ≥95 Battery 320mAh Charge Time (for Power Bank Box) about 2 hours Music Playing Time about 3 hours (The Music Volume will affect the time) Talk Time about 4 hours Standby Time 120 hours Charge Time1-2 hours Package Contents1x Pair of Earphones  1x Charging Box 1x USB Cable 1 x User Manual