Features: 

• Two modes of biofeedback - LED and 5-way audible tone
• 5-way audible tone feedback includes Proportional, Above and Below Thresholds and 3-second delayed alarm
• 13 segment LED bargraph visual feedback
• Wide and narrow filters provide precise monitoring of normal and fatiguing muscles and eliminate EKG artifact
• Highly-sensitive active sensor needs no skin preparation to locate muscle sites quickly
• DC voltage output connects accessories and permits computer monitoring
• Weight - 2.5oz