Sliding Touch Control & Easy Operation- The bluedio H2 wireless and wired over-ear headphones feature sliding touch control to adjust volume, change songs, wake up voice assistant and answer calls. Its built-in sensor chip also helps to get music to auto-play and pause when you put the headphones on or off. Convenient use will bring you a lot of fun. HiFi Sound Quality- Bluedio H2 Active Noise Canceling Bluetooth Headphones adopted large high-power drive unit in the headphone to show you more audio details such as brilliant treble and powerful and rich bass. HiFi sound quality with lower distortion, you can enjoy beautiful music more. Multiple Connection- Wireless Bluetooth connection gives you low latency, low power and low distortion audio listening, 3.5mm audio cable connection allows you to use and listen to the music you want even if your devices do not support Bluetooth. Inserting SD cards to listen to your favorite music without a mobile phone. 40 Hours Long PlaytimeBluedio H2 headphones adopt Bluetooth 5.0 chip, which can transmit data at high speed and bring you smooth music experience. And its low power ensures long battery life: up to 40 hours of continuous music. Your best partner for business travel and work- Bluedio H2 Bluetooth headsets are equipped with an airplane audio converter plug, no anxiety and worry about business, you can use the phone plug. equipped aircraft and manage commercial affairs on time, even in flight. Technical specifications Bluetooth: Bluetooth 5.0 Mandate: up to 10 meters (accessibility) Frequency range: 2.4 GHz - 2.48 GHz Support protocol: a2dp, avrcp, HSP, HFP Frequency range: 20hz - 20Khz Time of Music/Communication: about 40 hours Net ANC working time: about 60 hours BT ANC: about 30 hours Micro SD card support capacity: up to 32gb Charging time: about 2 hours