The IR200 is a TOA infrared microphone which takes two AA batteries. These batteries could be alkaline 1.5V, or rechargeable 1.2V NiMH types.
The IR200 can be charged using the IR200BC battery charger through its base conductors pictured above, if the IR200BT-2Y NiMH batteries are used.
The IR200 has a special charging tab for the IR200BT-2Y within the microphone, protected by FS1.
The battery voltage is boosted through L101 to 5V for internal use.