The Compact Lightweight Device Is Durable Waterproof And Features An Easy-to-read Display For Oral Rectal Or Under Arm Use Large Digital Display Last Memory Recall Beeps When Ready Measuring Range 90f ~ 109.9f Accuracy 0.2f (95.9f ~ 107.6f) / 0.4f (< 95.9f Or > 107.6f) Power Supply: One Button Battery: 1.5v Lr41 Ag3 Or Equivalent Weight / Dimensions~12 G / 12.2 Cm X 1.9 Cm X 1 Cm Ambient Operating Temperature: 60.8f ~ 104f