easy-to-read two color TFT display =low battery indicator particularly suitable for persons with ;heart failure, chronic obstructive pulmonary dieases, bronchial asthma = incl. retaining strap and belt pouch Specifications :- 1 x fingertip pulse oximeter1x lanyard ( hanging cord)1 x user manual2x aaa batteries. suitable for sports at high altitudes . (e.g. mountaineering ,skiing and aviation sports)