At less than half a pound and available in 4 different colors Transcend Micro 510 is the smallest, lightest Auto-CPAP machine on the market & it's Made in the USA. Don't let its tiny size fool you though, Transcend Micro 510 is packed with premium comfort features like auto-adjusting pressure, an adjustable ramp, optional battery options, whisper quiet performance, expiratory pressure relief, and unlike some portable CPAP machines... it's compatible with any CPAP mask too!