Features: Ergonomic Design: Foldable and adjustable headband length, soft leather ear cushion, easy for storage and comfortable to wear for a long time. BT 5.0 Connection: Advanced BT 5.0 technology offers fast transmission speed and high-quality signal. Easy to connect with BT-enabled devices. Long Battery Life: 200mAh rechargeable lithium battery ensures 8-10 hours of music or talking time and it has a durable standby time of about 120 hours standby time. Multiple Playback Modes: L350 headphones supports playing music via BT connection, TF card, FM radio and 3.5mm audio cable. Allow you to enjoy endless music. Hands-free with Mic: Built-in microphone enables hands-free calls to set free your hands when doing sports, and delivers clear and real talking sound.