Disassembled and cleaned. The circuit board has been cleaned with a circuit board cleaner. (See image 4 for disassembled parts (immediately before cleaning)) Operation check: 1. The amplifier buttons have been confirmed to work with a real A909 amplifier. 2. All buttons are confirmed to "transmit" using a mobile camera. * No battery leakage history. * Stickers "6" and "9" are attached. * Please note that batteries are not included. We strive to ship as quickly as possible.