Bluetooth version: V5.3 Earbud battery capacity: 200mAh Playback time: 4 hours Standby time: 120 hours Product color: black, white, green, pink STEREO SOUND EFFECT, HEAVY BASS VIBRATION: Built-in 10mm Large-size Moving Coil Unit In The Compact Headphones, The Bass Performance Is More Stunning, With High Sensitivity Composite Diaphragm To Show The Rich Music Details, To Realize The Sound Experience. This Wireless Headset Produces Powerful, Dynamic And Detailed Sound, Restoring Audio And Sound Dynamics. The Call Noise Cancellation Feature Allows You To Talk Clearly And Immerse Yourself In Your Music. ULTRA LIGHTWEIGHT ERGONOMIC DESIGN: With The Excellent Ergonomic Design, The Bluetooth Headset Fits More Closely To The Ear Canal And Is Less Likely To Loosen Or Fall Off When Exercising. SPORTS : The Wireless Headphones Are Nano-coated To Withstand Daily Splashes, Sweat And Rain. For Strenuous Sports And Outdoor Activitie Bluetooth 5.3 And Auto Pairing: Bluetooth 5.3 Chip Provides Faster Pairing, Stable Connection And Signal Transmission . Once The Bluetooth Function Is Turned On, The Headset Will Automatically Turn On And Connect When You Take It Out. The Powerful Bluetooth 5.3 Chip Works Perfectly With Tablets, Laptops And Smartphones.