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If you're passionate about IT and electronics, like being up to date on technology and don't miss even the slightest details, buy Headphones Sennheiser RS-2000 Black at an unbeatable price.. Approx. charging time: 3 hours. Approx. autonomy: 9 hours. Characteristics: Wireless. Type:. Headphones. Neodymium. Colour: Black. Material: Plastic. Year: 2017. Type of headphones: In-ear headphones. Voltage: 3,7 V. Number of pieces: 4 Pieces. Battery: 350 mAh. Connections: Jack 3.5 mm. Range: 50 m. Includes:. Adapter AC. Jack 3.5 mm. Instruction manual. Cushions. Control type: Dynamic. Battery type: Litio Ion. General Product Safety Regulations information:. Sennheiser electronic GmbH & Co. KG. Am Labor 1, Wedemark, Germany, 30900. 30900 - Wedemark. +495131530. contact@sennheiser.com. https://www.sennheiser.com