Wireless pin microphone system featuring the 511DRH receiver and 52BT transmitter from the domestic manufacturer AZDEN (Atsuden). This pin microphone allows for hands-free use, making it suitable for lectures, theater performances, seminars, yoga classes, events, and audio recording for video production like YouTube. You can use it with peace of mind as it uses the 800MHz band (B band) permitted in Japan. *Please be aware that inexpensive Chinese-made products sold on Amazon and other platforms may use radio waves prohibited in Japan. The transmitter operates on two AA batteries. Please note that one antenna on the transmitter and one antenna on the receiver have been repaired. There are no functional issues. Thank you for your understanding. Functionality has been confirmed, but this is a used item. Please refrain from purchasing if you do not understand that this is a used item.