1.Engonomic design, comfortable to hold, again to operate, reducing weariness eflectively 2.Advanced optical technology and optical I C, high precision. 3.RF wireless ID techology (256ID available) a dopted, transfer the signal in full angle. 4.Intellectual electric-saving technology and best recharging circuit design provides the vest saving solution. 5.Intellectual alerting circuit design shall remind user to recharge power on time.