5 color: Black, white&black, blue&white, yellow&white, white

- Patented 4-way screen orientation;
- Low power consumption, working 30 + continuous hours;
- Low Perfusion ≤ 0.4%;
- Onekey design with automatic power on / off Detects When no signal for 8 seconds;
- Portable, Small and lightweight;
- Real-time spot-checks.
- Pulse sound function, alarm function.
- 2 AAA alkaline batteries