sony wireless headphones (babe's gift) Rechargeable wireless headphones with 100m listening range Technical Details Ear coupling: circu-maural Headphone frequency: 20 - 20000 Hz Driver unit: 40 mm Magnet type: neodymium Connectivity technology: Wireless Listen at high volume without waking anyone Ultimate listening freedom with 100m range Long battery life and smart power saving switch No commenti , by Unknown