Medirom more than triples on double rollout plan of human authentication devices

** Shares of Japan-based wellness firm Medirom Healthcare Technologies MRM rise 208% to $4.48 premarket

** Co said late on Thursday it will double the number of stores installing Orb, a device used to verify human identity, to 200 locations across Japan

** Last month, co partnered with Sam Altman's 'World' network to roll out Orb in Japan

** Medirom said it will complete the rollout of Orb devices at 100 of its Re.Ra.Ku relaxation studios by the end of this month

** As of last close, stock up 40% YTD