1, finger oximeter CE certified 2, OEM brand accept 3, SpO2 ... 30bpm-240bpm, Resolution: + 1bpm3, Power supply requirement: 1.5V(AAA size) alkaline battery x2 Battery voltage: 2.6V—3.3V4, Operating ... power off automatically in 8 seconds when there is no finger in the devices.11, Photosensitive components: red light ( wavelength : ... A hanging rope2, Four batteries3, A pouch4, A User Manual finger oximeter