Aiwa HST-250BT Bluetooth Headphones. Luxurious soft leatherette earpads and headband cushion,3D Ear muffler Comfortable to Wear.Over-ear (circumaural) design for maximum ambient noise isolation.Optimized acoustic architecture with high definition HYPERBass audio.Hi-Fi Quality Audio with 20Hz-20KHz , 40mm Drivers, 32 Ohm.Bluetooth 5.0 Wireless Audio works with all mobile devices.Wireless Range: 10m (30 Ft.).Built In Microphone for handsfree phone function with 13 hour Talk Time.AUX in 3.5mm jack for wired usage (1.5m High Quality Audio Cable included).Ergonomic flexible headband with swivel+fold system for travel convenience.Iron Bow Design to Increase Product Bow Life and Texture.Micro-SD (TF) card slot for MP3 playback (32Gb readability), works without mobile phone.Micro USB port for universal recharging.Profile Support - HFP/A2DP/AVCTP/AVDTP/AVRCP.Ultra low power consumption - 12 hour music playback.Rechargeable Lithium Molymer Battery: 3.7V, 250 mAh, 2 hour charging time..AIWA exclu