Features: 1. Voltage warning: when the battery voltage is too low may affect normal use, there is a low voltage warning prompt. 2. Automatic shutdown: when no signal is generated, the product will automatically shut down after 8 seconds. 3. Energy saving and environmental protection: the product has low power consumption, and the two AAA batteries can be used continuously for more than 40 hours. Description: The blood oxygen probe and the processing display module are integrated into one, the product is simple to use, low power consumption, small size, light weight and easy to carry. Specifications: Color: Blue Material: ABS+PC Sleep monitoring time: 8 hours Display direction: OLED blue and yellow display, 6 display modes, 4 display directions Blood oxygen range accuracy: 70% ~ 100% ± 2% Pulse range accuracy: 25 ~ 250BMP ± 1bmp Blood flow perfusion index: ≥0.2%, ± 0.1% Working current: ≤30MA Power requirements: 2* AAA batteries(Not Included) Size: 6 * 3.5 * 3.3cm Package Included: 1 * Oximeter 1 * English user manual