EP8 Wireless Pen Improve informatin as bellow:
1. Displayable battery
2. With RCA connector, can be connected to traditional power supply
3.With extra grip
 
Material: Aircraft Aluminium
Motor: Germany formula Precious metal brush DC motor
Speed:11049 RPM
Output Power: 5 W
Working volt: 4.2-12V DC
Stroke: 3.5mm / 4.2mm
Needle Protrusion: 0 - 4.45mm
Charging Voltage: 5v-2A
Charging Time: 3 Hours
Usage Time: 4-8 Hours (Some Customers have reported more than 8 hours on a single charge)
Nominal Capacity: 1900 mAh