Mast Lancer wireless pen machine, it is equipped with a high-end portable power pack, which contains a portable battery, the battery can be individually charged by a battery charger. The battery can be used a minimum of 2-3 hours depending on the voltage use and only needs to be charged for 1 hour. <br>Lancer maintains the standout features of the original Mast with reliable, extended performance, efficient operation, and ease of use <br>This wireless tattoo machine runs on 1900mAh rechargeable batteries and can operate continuously for 8 to 12 hours depending on use <br>With the press of a button, you can easily turn on the machine and adjust your voltage in 0.1v increments; the LED screen shows your operating voltage. <br>You can also adjust the needle length from 0mm up to 4mm with a simple twist of the grip