CHARACTERISTICS1. Keys* Humanity key design, two scan keys, two accumulation keys;*The intelligent keys on the left and right side, convenient for left or right handusing.2. Screen display* LCD display* Battery capacity indication, charge indication;* Low power alarm indication; * Chinese and English operation interface switch;* Different indication direction if press different left or right key;3. Battery* Use high capacity Li-ion battery* Use lower power consumption charge management chip, charge electric current limitis 320MA* Provide universal charge to charge* Customer also can choose PC USB connection interface to charge;4. Power switch on and off* Power On by pressing any key; * Power auto off after operation stop for 30 seconds5  Count* Two kinds of count mode: Accumulation count and single time count.