Peak Flow Meter Alarms Just pop open flip up Jobst Opaque Sensitive Just pop open flip up back and put on footrest Limited lifetime warranty The J Brace Patellar Stabilizer is a 1 8th thick 13 long sleeve with two lateral and two medial spiral steel stays * It also has a tubular rubber buttress to align the patella * Laterally attached straps pull medially to displace force to the patella * The J Brace allows compete range of motion while providing stability * 18 20 * Manufactured from DermaDry which combines the breathability and water vapor transmission capabilities of open cell sponge rubber with the durability stretch and compression of neoprene * This process allows perspiration to evaporate and is further enhanced by the KwikWick treatment of the soft polyester that coats the inside and outside of the braces * A flame lamination process is used to secure the KwikWick treated polyester to the rubber eliminating the need for industrial adhesives a known cause of contact dermatitis * Excellent for patellar instabilities subluxations and dislocations * Assists in early detection of asthma attacks * Accurately measures peak flow * Reusable mouthpiece included with unit * Zone markers for easy reference * Dual flow range for adults and children * Ranges from 0 800 L M * Accuracy has been verified by an independent testing laboratory to meet NAEP (National Asthma Education Program) standards