Website: https://uvbled.com/products/psoriasis-therapy-lamp-1 If you will not like the results, return the lamp for a refund The lamp treats area of 4 × 4 inches 10 × 10 cm The treatment time is 20 seconds The distance between the lamp and the skin is 4 inches 10 cm Use the lamp weekly or twice a week according to your need 110 240V 4 watts https://uvbled.com/products/psoriasis-therapy-lamp-1