Digital Puluse Oximeter can be used for one induvidual or 100 people and stores the last 200 readings every single time! Runs on 4-AA Bateries. Maybe be used on Adults, Pediatric(Children)and Neonatal. Heart (Pulse) Rate Range: 25-254 bprn. Total Weight: 130 grams without batteries. Size: 140 x 65 x 31mm. Data transfer to PC for storage or printing. Blacklight built-in for night time use.