**missing the external white cap** The XTRALLUX Extreme RX Hair Regrowth Cap is a wearable photobiomodulating device intended to treat androgenetic alopecia (AGA) with continued usage. Red laser energy is delivered to the scalp during each daily 6-minute treatment session to restore viable hair follicles for healthy hair growth. This device is cleared by the US Food & Drug Administration to treat Androgenetic Alopecia in males and females. The XTRALLUX device should be used 6 minutes every day. Do not exceed recommended usage. Increases volume of hair on scalp. Medically-accepted way to stabilize & prevent hereditary hair loss. Restores healthy hair growth by revitalizing scalp follicles. Clean, mess-free treatment for both men & women. Drug-free & safe treatment using light energy. No known adverse side-effects. 6-Minute auto-programmed sessions Hands-free use with rechargeable Li-Ion Battery Pack Comfortable, flexible interior adapts to head shape.