Type: Battery Power Supply: 2.4 V DC / 70 mAh Weight: 0.10 lbs. Features: Battery Chemistry: Nickel-Metal Hydride (NiMH) Maximum Battery Run Time: 6 Hour Sennheiser Headsets: - IS 150 - IS 300 - Set 810 - Set 250 - Set 500 - IS 380 - Set 820 - Set 2500 - RS 4 - RS 6 - RS 8 - RS 400 - RS 30 - RS 40 - RS 45 - RS 60 - RS 65 - RS 80 - RS 85 - RS 2400 - HDI 302 - A 200 - HDI 380 - RI 150 - RI 250 - RI 250 J - RI 300 Parts: 2 years limited Labor: 2 years limited