Cameron Sino Rechargeble Battery for Sennheiser RI410 Type: Li-ion, Volts: 3.7V, Capacity: 150mAh Dimension: 32.00 x 25.00 x 7.00mm, Weight: 50g All Products are Certificated with ISO9001, RoHS & CE 14 Days Money Back Guarantee and 12 Months Warranty