Oximeter Lk87 Finger Pulse Oximeter Blood Pressure Meter_ Purchase invoice: must be requested at the same time as the order and will be sent via email. In the absence of billing data, a receipt will be issued which cannot be cancelled. Simple and convenient, small, lightweight, easy to carry all the qualities present in this pulse oximeter. A signal appears on the display to indicate when the battery power is not sufficient to guarantee correct operation. Automatic shutdown after 8 seconds without signal. Simply inserting a finger into the oximeter is enough to obtain the oximetry and pulse/minute values after a few seconds. Two AAA batteries guarantee measurements for approximately 30 hours. Batteries: 2 AAA alkaline or rechargeable batteries; 30 hours of continuous use Accuracy: 80% –.