The Berry Company Sports and Aviation Sleep Monitor USB Oximeter Fingrtip Pulse Rate and Blood Oxygen Saturation Monitor oximeter for sports and aviation only Parameter: Spo2, Pulse We have reusable sensor(gray one) for adult and disposable sensor(white one) for child. You can leave a message about which one do you need. If you don't leave a message, we will send the reusable sensor. With Free APP Connect the PC / Mobile Phone Directly Attention: Only can be used to android system with OTG function