Specification: Headphone: Bluetooth-Compatible version: V5.0+EDR Wireless frequency: 2.4GHZ Support protocol: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3 Transmission distance: 10 meters Battery capacity: 50mAh Charging voltage/current: 5V/1A Play/talk time: approximately 4 hours Charging time: approximately 1 hour Standby time: 120 hours Horn impedance: 8MM 32 Ω Mic sensitivity: -42dB Working temperature: -10-50 ℃ Charging case: Input voltage/current: 5V/1A Battery capacity: 400mAh Optional: 1st and 2nd generation Packaging size: 145 * 80 * 25mm/5.71 * 3.15 * 0.89in Gross weight: 155g Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Earphone 1 x Charging Case 1 x Charging Cable 4 x Ear Cap 1 x Instruction Manual 1. Bluetooth-Compatible 5.0: These earphones feature advanced Bluetooth-Compatible 5.0 technology, ensuring a stable and high-quality connection. The premium chipset guarantees excellent signal quality and outstanding audio performance for an immersive listening experience. 2. HD Voice Support: Equipped with a built-in high-definition microphone, these earphones can recognize and isolate voices, reducing background noise interference. Enjoy clear audio and natural sound reproduction, allowing you to enjoy high-quality music and clear phone calls anytime, anywhere, just like face-to-face communication. 3. Sweatproof and Dustproof: With the sweatproof and dustproof rating, these Bluetooth-Compatible earphones are perfect for use during workouts, outdoor activities, and more. Never worry about excessive sweating or environmental factors affecting their performance. 4. Convenience and Comfort: The Bluetooth-Compatible 5.0 earphones are designed to rotate and adjust for a secure fit. They are lightweight, comfortable, and tailor-made for long-lasting wear. The unique high-end portable case protects the earphones from damage and loss, ensuring they are always ready for use.