3.8 cm, 4mm thick
· Weighs approx 7 grams
· Lightweight polypropylene case
· Resonating cell
· 25 m coil of fine copper wire
· Extremely durable and waterproof
· Requires no batteries and no maintenance
· Supplied with black hypoallergenic cord
· Easy to use - simply wear it inside or outside a shirt or blouse, facing
  either way
· It requires no special care just remove grease or dirt with a soapy cloth
  and rinse.