We are offering fingertip pulse oximeter. product specification: \r\n\r\ndisplay mode: dual-color oled display ( blue & yellow) \r\npower supply: two 1.5v (aaa size) alkaline battery \r\nbattery voltage: dc2.6v~3.6v \r\nhigh accuracy and durability \r\nspo2, pulse rate, bar graph, pulse waveform display \r\nlow battery capacity indication \r\nautomatic power off function \r\nsix models adjustable by pressing the button shortly \r\nfour levels adjustable brightness. \r\ndisplay format can be saved after power off \r\nvarious color of cover can be selected