instructions found in this manual before operating or using the unit. Know the limitations and hazards associated with using the OptiFlex 3 Continuous Passive Motion (CPM) Therapy Unit. Observe any and all precautionary and operational decals placed on the unit. Only use OptiFlex 3 on firm, flat, level surfaces. OptiFlex-K1™ Knee CPM. Weighs just 23 lbs (10.4 kg), making it the lightest knee CPM on the market Only 38 inches (97 cm) long Wide low-profile, closed-base frame for stability