HQRP TWO Rechargeable Batteries for UNIDEN GMR638 GMR638-2 GMR638-2CK GMR638-3CK Two-Way Radio plus Coaster HQRP&reg; TWO Rechargeable Batteries plus HQRP&reg; Coaster; Battery Voltage: 4.8 Volt; Capacity: 700 mAh; Ni-Mh; Keep in touch with friends and family and never miss a conversation; 100% compatible with Original Battery; 200 Days warranty!