Garmin's HRM 200 is a heart rate monitor for your basic tracking of accurate heart rate data. It's designed to send accurate and real-time information to your compatible device and apps to better understand your fitness and general health. 

Key features:

• Chest based heart rate sensor
• Stores heart rate data
  
• Up-to 1 year battery life (1hr/day use)
  
• Real time data transmission
• Pairs with Garmin Connect™ app

Specifications: 

• Waterproof up to 3ATM
• User-replaceable battery included 
• Machine washable strap
• Dimensions (mm): 68.0 x 31.6 x 11.0 
• XS-S: Strap length (cm): 56–72 
• Fits chest size (cm): 60–85 
• M-XL: Strap length: 72–106
• Fits chest size (cm): 80–119
• Weight: 20g (module only)
• SKU: 010-13388-01