Specifications: Product Name: MD518 Product size: 76.5*57*36mm Product color: Black/Silver Transmission distance: 10m (accessible open place) Sensitivity: 96dB±3dB Charging interface: TYPE-CBTMV09 Bluetooth version: 5.1 Earphone type: In-ear Microphone: Yes Noise Reduction: Active Waterproof: Yes Playback Control: Yes Frequency response range: 20Hz~20KHz Impedance: 32Q±15% Ultra-long standby: 240 hours Charging times of charging compartment: 4-6 times Features： 1. [Lightweight & Snug Fit] Featuring an ergonomic in-ear design and weighing only 0.15 ounces (one earbud), the wireless headphones securely fit your ears and will not be easy to fall off, mini wireless earbuds bring you a stable and comfortable wearing experience. The compact and sleek charging case fits easily in a pocket, thus you can take it with you anytime & anywhere. The clean appearance makes it not only earphones but also a small decoration on your ears. 2. [Great Battery Life] The wireless earbuds alone provide up to 4-5 hours of high-quality sound output on a single charge, and the included charging case provides an additional 7 charges, giving 30 hours of total playtime. 3. [Senseless Delay & Clear Call] The wireless headphones are equipped with Bluetooth 5.3 chip for a more stable connection, faster transmission speed, and stronger signal. 2 mics with environmental noise reduction technology work together to monitor the sounds around you and instantly produce an opposite signal to reduce background noise, allowing you to hear crystal clear calls like you are communicating face to face with others. Handsfree calling during sports anytime and anywhere 4. [HIFI Stereo Sound] Driven by a 13-mm high-fidelity speaker and composite diaphragm unit, these TWS wireless earphones deliver a loud and crisp sound with deep bass and balanced mids, immersing you in your stereo music world. 5. [A better solution for sleep] use innovative noise cancelling technology; We engineered masking sounds combine to cover unwanted nighttime disturbances 6. Open the earbuds charging case to automatically boot and connect to the phone, and automatically shut down and charge when put earbuds into the charging case, It is easy to use. Package includes： Earphones * 2 Charging case * 1 Charging cable * 1 User manual * 1 Packaging box *1 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.