Due to State and Federal Law, we sell Syringes and Needles only to the Medical Facilities. Simple to use - Bright LED displays and easy 3-button operation * Reliable - Proven Nonin pulse oximetry technology and accuracy * Flexible - Numerous documentation options * Efficient - 100 hours of typical battery life * Compatible - An array of Nonin sensors can be used to conveniently monitor neonates, infants, children and adults * Power Requirements......... Six 1.5V AA-size alkaline batteries