Guarantee of stable transmission: Bluetooth V5.1 ensures faster transmission, a larger range and a more stable connection. Powerful bass provides dynamic feeling: 40mm NdFeB driver with excellent resolution delivers clear, detailed and powerful sound. Up to 30 hours playback: Boasting its large battery capacity, the headphone provides 30 hours playtime. Never worry about the battery run down. Playback time may vary depending on surroundings, volume level and audio sources. Classy and minimalist design: The integrated appearance, simple, low-key and stylish, the matte surface highlights the high-end texture and represents a trendy preference. Ergonomic design for comfort wearing: Over-the-ear design using breathable soft leatherette ear cups for all-day comfort. Pairing two devices easily switch over: Support connecting with two Bluetooth devices simultaneously. Easily switch between work and entertainment. Wireless/wired is up to you: A 3.5mm audio cable is included for wired connection, keeping the music on even when the battery runs out. Built-in microphone supports calls when Bluetooth is connected.