Pulse oximeter, produced by Shenzhen Zhonghao bioelectronics Co., Ltd., has China medical device registration certificate "and CE certificate. This product has the following characteristics: portable, easy to carry and use; TFT, 0.96 inch color screen (options: LED or OLED screen) operating temperature - 10 „ƒ to + 40 „ƒ, size 60 * 37 * 36mm, weight 34 g 1.5V alkaline battery or rechargeable lithium battery, 1.5vw power supply.