WA Macintosh 4 Fiber Optic Laryngoscope Blade Comb Ultrasound Muscle Stim * Operates on 9 volt Imaging * Operates on 9 volt battery * Effective easy to use electronic muscle neuromuscular stimulators * Easy one hand operation including current adjustment active probe positioning and on off control * Two year warranty on materials and workmanship * Weight: 5 ounces * Ideal for facial and smaller peripheral muscles * Weight Limit Description: None if sized to user Removable repolishable light pipes make these the longest lasting fiber optic laryngoscope blades in the world * Reduced handle and blade weight for improved balance and maneuverability facilitating even the most difficult intubations * Repairable allowing replacement of the deteriorating light payways for a fraction of the cost of a replacement blade * Single piece stainless steel blades ensure blade integrity (no soldered joints) * Overall length 160mm * Inside base to tip 135mm