Review on High-Performance Ambition Ninja Wireless Tattoo Machine with LCD Digital Display, 2400mAh Power Supply, Japan Coreless Motor, and Cartridge Pen for Permanent Makeup - Ideal for Professional Tattoo Artists by Kimberly Marquez

Bought a set with an extra battery in March and was pleased. I ended up buying 2 more sets in April with extra batteries for backup and one of them runs very hot after 1 hour of use. Aupdate * 10/14/21 - All three of my machines are having problems. One is still heating up and it hasn't even been two hours since it was turned off. The second machine makes too much noise and shakes which also causes the machine to turn off even if the battery gauge isn't dead. My third car won't last long. I need to hold it at an angle so it doesn't make too much noise/vibration. Did I really get 3 defective machines?!