YX01 Sweatproof Bluetooth 4.1 Wireless Bluetooth Earphone, Support Memory Connection & HD Call 1. Bluetooth 4.1 chip, low power consumption, faster connection. 2. Built-in DSP noise reduction technology, dual noise-reducing sensitive microphone, the caller voice is clearer. 3. Anti-sweat structure design, effectively extend the life of headphones. 4. Mini-small, it looks like invisible when worn, no sense of presence. 5. Compatible with mainstream Bluetooth-enabled mobile phones, computers and tablet devices. Product specifications: 1. Bluetooth version: V4.1. 2. Transmission distance: 10m. 3. Frequency: 2402-2480GHz. 4. Microphone sensitivity: -40+-2dB. 5. Talk time: About 5 hours. 6. Music time: about 6 hours. 7. Charging time: about 2 hours. 8. Headphone battery capacity: 60mAh. 9. Standby time: About 100 hours. 10. Single earphone weight: about 5g. 11. Single earphone size: approx. 15mm.