I am selling this because I accidentally purchased it. If you are looking for one, please consider it. The Amazon selling price was 2780 yen. It is new, but it has been opened to check the contents. I realized I had purchased it by mistake after trying it once. Thank you for your purchase if you can agree to this. The following is a product description from the Amazon site. For your reference. [Battery-Free Automatic Power Generation Design & Easy Installation] The transmitter automatically generates power every time the button is pressed, so there is no need to replace batteries. It is environmentally friendly and sustainable with zero running costs. Installation is also easy, with the transmitter attaching in 3 seconds with double-sided tape, so there is no need for construction and you won't damage the walls, making it safe for rental properties. The receiver can be used immediately by plugging it into an outlet. It can also be fixed with screws if necessary. It is a compact size that is ideal for narrow Japanese entrances and for adding more doors. (※Communication may become unstable if used near metal doors. Be sure to choose a location away from metal structures for installation.) [Wide-Range Communication & Free Expansion] Communication distance of up to 300m in an area without obstacles. The sound can reach even in complex Japanese houses, such as houses with gardens, apartment hallways, and entrances. (※Differences in the installation environment may affect the communication distance.) Multiple sub-receivers can be added, and can be installed in separate rooms or on the second floor. When visitors arrive, you can receive chime notifications anywhere in the house, so it can also be used for monitoring the elderly. [Weather-Resistant Design & Memory Function] It clears the IP44 waterproof and dustproof standards, and is compatible with humidity and snowfall during the rainy season. It operates in a temperature environment of -20℃ to 60℃, so it is compatible with all of Japan from Hokkaido to Okinawa. It has a backup function that remembers the settings even during a power outage, so you can rest assured during a disaster. It works even in sudden rain or dusty environments when installed outside the entrance. [Over 60 Kinds of Ring Tones & 7-Step Volume Adjustment] Built-in over 60 kinds of chime ringtones that are familiar to Japanese life. You can change the chime sound according to the season or visitors. The volume of the wireless chime can be adjusted in 7 steps from 0-115dB, and can be heard on the second floor. Also, it notifies with light in silent mode. It can be used without stress in households with children or pets, and in areas with noise regulations at night.