manual link with several languages included:
https://img.kwcdn.com/product-file-public/1f19f1030e0/f75bc5f6fabd248308f37ec82e5aa0e7.pdf?_x_sessn_id=0ytjw0socj&refer_page_name=goods&refer_page_id=10032_1713345565615_8mk4cqooem&refer_page_sn=10032
Power Mode: USB Charging
Operating Voltage: ≤36V
Battery Properties: Rechargeable Battery
Rechargeable Battery: Lithium Battery-Polymer
Applicable body parts: Whole Body
*free returns for 30 days if product is damaged, missing items, or doesn't fit picture description