Detailed product description 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. 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; 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; Power: switch on and off power on by pressing any key; power auto off after operation stop for 30 seconds Count: two kinds of count mode: accumulation count and single time count. Detailed product description 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. 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; 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; Power: switch on and off power on by pressing any key; power auto off after operation stop for 30 seconds Count: two kinds of count mode: accumulation count and single time count.