With a professional aircraft aluminium body, this Viper Wireless Pen Machine boasts a weight of 192g and a diameter of 31mm. The black and grey variants have a 3.5mm stroke, while the red variant has a 4.0mm stroke. The high quality coreless precision motor has a PRM range of 8V-10000rpm and can work for 5-9 hours on a single battery. Additional features include a removable battery, a charger with 2 batteries (18500 1800mAh), and a working volt range of 4.5-11v. To preserve the battery life, it is recommended to remove the battery if the machine will not be used for an extended period of time.
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