Feature: 1. Perfect sound quality. It offers perfect sound quality and clear communication no matter when listening to music or making a call.2. Compatible with most Bluetooth devices, including all Android and IOS smart phone. 3. Easy to wear, perfect for your daily life. 4. Ultra long battery life. The Bluetooth headphone supports up to 10 hours of playing music, 2.5 hours of talking with 400mAh polymer Li ion battery for one off full charge. 5. Built in Bluetooth 5.0 chip, easy to pair with your smart phones, tablets and other Bluetooth enabled devices. you can enjoy skip-free music in a 10-meter working distance. 6. Built-in HD microphone, offering crystal clear sound for hand free conversations. 7. Compatible with most Bluetooth devices, including all Android and IOS smart phone. 8. Build-In TF Slot and maximum support 32GB TF card. (Note: The TF card is not included) 9. Foldable design make it easier to carry and save your space, you can bring it wherever you want to go. (TF mode only support for MP3 format.) 10. Unique romantic LED breathing light can switch color automatically in 7 colors, you can enjoy the cool & romantic light at night. Specification: Item Type: Bluetooth Headphone Bluetooth version: v5.0 Bluetooth mode support: A2DP 1.2, AVRCP 1.0, HSP, HSF 1.5 Frequency: 2.402-2.480GHz, 2.4G ISM band RF performance: receiver sensitivity: -84dBm; transmit power up to 4dBm Frequency response: 20 Hz-20 kHz Signal to noise ratio: 70dB; Total harmonic distortion rate (THD) 0.1% Power indicator: red and blue flashing Headphone battery: 400mAh lithium battery Charging time: 2.5 hours Call time: about 10 hours Play time: 8-12 hours Standby time: up to 20 days Working temperature: -20 C -55 C. Other functions: support TF card (maximum 32G, need to purchase separately) support status indicator, charging indicator displayColor: Black, Black + Red, Red + BlackWhite (Optional) Item Size: As the picture show Weight: 184g Package List: 1 * Bluetooth Headphone 1 * Audio Line 1 * Charging Cable 1 * User manual