Description: Smart Translator Headset: Support 144 languages real time translation. Suitable for business, learning, travel, etc. Noise Cancellation: Built in high sensitive microphone, noise canceling technology, Hifi stereo, allowing you to enjoy high quality real time translations, calls and music, even in noisy environments. LED display: LED digital display screen, real time understanding of the remaining power of the charging case and the left right headset. Wireless V5.1: Wireless headset V5.1 provides a more stable connection, lower latency, faster paring and universal compatibility, 10 meters connection. Long Standby: 400MAH capacity rechargeable charging case, 80MAH headphones, long standby time is 80 hours, play and talk time is about 7 hours. Ear hook, comfortable to wear, without burden to the ear canal. Specification: Product size: 6.3cmx6.3cmx3.1cm/2.48inchx2.48inchx1.22inch Material: Plastic Transmission distance: 10 meters Battery capacity: 80mAh/400mAh Charging voltage/current: 5V/1A Play/talk time: about 7 hours Charging time: about 3 hours Standby time: more than 80 hours Speaker impedance: φ16mm 32Ω Microphone sensitivity: -42Db Online languages: 144 languages Package Includes: 2 Headsets 1 Charging Box 1 Charging Cable 1 Manual Note: Please allow slightly errors due to manual measurement and different monitors.