Designed for those who value comfort in use and high quality sound. Fully wireless headphones will give you complete freedom of movement. 4 modes of operation - Bluetooth communication, FM radio, AUX input, Micro SD card reader. Built-in buttons so you can control your music without going to the sound source. Astonishing sound thanks to 40mm drivers. Microphone for easy conversations. Soft cushions allow you to listen to your favorite songs comfortably without feeling tired. Adjustable headband length. Lightweight durable headphones let you take your music with you wherever you go. Powered by a built-in battery. The rechargeable battery is charged via a USB cable. Specification: Bluetooth version: v5.0 Range: up to 10m Speaker: 40mm Microphone: Yes Battery capacity: 400mA Music playback time: ~10 (time depends on volume settings) headphone sensitivity: 105 dB Impedance: 32 Ohms Material: ABS Frequency response: 20-20,000Hz Memory card reader: Micro SD up to 32GB Ports: Micro USB, Jack 3.5mm Charging time: 2h