Features:

1. LCD display and LED display
　　2. With the functions of alarm upper and lower limit setup, brightness and volume adjustment .
　　3. Have the trends map, trend data playback functions (except for the LED display)
　　4. Have the power-saving mode, power-down memory function (except for the LED display)
　　5. Built-in rechargeable lithium battery(except for the LED display)
　　6. Scalable data output function(except for the LED display)