What battery does it take. The helpful 60 second reset timer lets you know that the thermometer has reset and is ready for a second reading. Infrared Baby Kid Digital LCD Thermometer Non contact 3.3 out of 5 stars with 111 reviews.Safety 1st thermometer battery. Comfort check digital pacifier takes a fast, accurate reading in 90 seconds. To avoid damage to probe do not bend beyond 45° (as shown in above diagram). Attached below are instructions for the baby's 1st digital thermometer.included in