1.Battery: 9V 300mAh rechargeable Ni-MH batteries 2.Battery charger Independent charge design, be free to charge 1 or 2 9V lithium,Ni-MH,Ni-Cd rechargeable batteries you need, not must by pairs 3.Charges 1~2 pcs 9V batteries, LED light indicator shows the charging progress: red light on - charging, green light on - charging complete. 4.CITYORK 9v batteries are suitable for cameras, microphones, smoke alarms, alarm clocks, porch table radios and more.