Earmuffs Xstream LD. Bluetooth version: 4.1, A2DP 1.2, HSP 1.1, HFP 1.6. streaming and telephony, level-dependent microphones (LD) enable ambient listening, built-in voice microphone (a boom microphone is optionally available). Supports voice assistants, push-button operation, operating time up to 55 hours, standby time up to 100 hours, charging time 3 hours. Design: Ratchet size adjustment on both sides, Approval/standard: Protection against splashing water on all sides in accordance with IPX4, Weight: 386 g.