ELFACE FMB-201 This is a junk item. After turning it on, the sound stops after about 10 seconds (confirmed with new batteries). Purchased on Mercari in 2023. The previous owner purchased it in January 2022 from Gangnam Doll. It runs on batteries. * S Mode: Skincare to improve skin firmness is effective when done once every three days, in the evening (doesn't need to be done daily). * L Mode: Lymph circulation and swelling care is effective when done daily / Morning puffiness is visibly reduced in 5-10 minutes. Home beauty devices are characterized by their effectiveness when used continuously, so it's important to choose one that is easy to stick with.