Video Enjoy the best sound quality with this Bluedio HT Bluetooth 4.1 Headphones. It features Bluetooth 4.1 that has lower power consumption and convenient to listen to music which just need an audio cable. With 57mm drivers, it can create super bass stereo sound. It's perfect for outdoor and indoor use. The Bluedio headphones have 4 in-built language prompts (Chinese, English, French, Spanish), this enables you to effortlessly communicate with others in your language. The ultra large dynamic drivers in the Bluedio enable you to feel quality sounding bass effect. With a large 650mAh battery the headset will have a continuous music play time of up to 40 hours. The anti noise reduction will effectively reduce any outside noises while using the headset. Bluetooth 4.1 With robust high speed CPU of Bluetooth 4.1 operating system, comes with ultra-long 40 hours music, 45 hours talk and 1625 hours (around 67 days) standby time, the same battery, decrease up to 40% power consumption compare to Bluetooth 4.0. Echo & Noise Reduction Technology Acoustic echo cancellation and noise reduction effectively reduce ambient noise while talking, make far-end listener cannot hear what you said become history, just like talking face to face. Super Bass Unexpected 57mm ultra-large dynamic drivers, turbine style housing, let you feel the bass resonate deep in the chest, enjoying the best sound quality. Line in&out Support Just a plug with audio cable, then listen to your favorite tunes from your smart phone or tablet, or share it with the headphones of your friends. Voice Prompt The HT headphones also incorporate 4 languages voice prompt (Chinese, English, French, Spanish), to communicate with you in your language. Powerful Battery & Low Consumption Offers up to 40 hours of listening pleasure with 650mAh large capacity battery. Specifications Name Bluedio HT Bluetooth 4.1 Headphones Brand Bluedio Model HT Type Sport Bluetooth Version V4.1+EDR Bluetooth Profiles A2DP, AVRCP, HSP, HFP Drivers 57 mm Impedance 16Ω Sensitivity 118dB Operating Distance 10 M Frequency Range 2.4GHz-2.48GHz Frequency Response 20Hz-20kHz Talk Time 45 hours Music Play Time 40 hours Standby Time 1625 hours Charging Time 2 hours Charging Interface Micro-USB Product Weight 218 g Product Size 17.2 x 8.5 x 18.2 cm Package Weight 250 g Package Size 21 x 22 x 9 cm Package Contents 1 x Bluedio HT Headphones1 x Audio Cable1 x USB Cable1 x User Manual