Handheld Pulse Oximeter with Varying Audible Pulse Tone is manufactured by SS Technomed Pvt. Ltd. SS Technomed Pvt. Ltd. Is an ISO 9001:2000 certified company. The Handheld Pulse Oximeter includes audible pulse tone that varies in pitch with rise and fall of oxygen saturation. There are audio and visual alarms for saturation and pulse rate. Previous alarm level settings can be recalled from memory and the Handheld Pulse Oximeter can be hand-held or easily mounted on wall, tabletop, or IV pole. There is a rechargeable NiCad battery or continues AC operation.