Accu-Beep feature ensures fast, accurate readings, Check basal temperature to understand your fertility cycle, Auto memory shows last temperature taken, Mercury free, Oral or rectal use, Clinically proven to match glass thermometer accuracy, Continuous beep confirms you are using the thermometer correctly, Signals when complete, As fast as one-minute temperature read-out, Automatic shut off, Battery and storage case included, SKU: ALVHT11638