FX S9 Professional Cordless Hair Trimmer.
These trimmers are excellent. Smooth & clean cutting, with nice build quality, 3+ hour runtime, and feel great in hand. They're available in 3 brilliant colors and when zero gapped, have very good cutting performance out of the box. They run super cool, are quieter than the more expensive BB alternative, look amazing, and the cutting blades can be replaced/upgraded with an Andis T-blade if you so choose (purchasable above, stock blade included). They're just an all-around excellent clipper.
 
Notes / Recommendations:
We recommend zero gapping the stock blade for best performance, which can easily be done yourself.
The Andis GTX or GTX-Z T-blades work excellently as a replacement / upgrade to maximize the cutting performance. 
Video Review: https://youtu.be/CMnbLbnKLK4
Overall Score: 9/10
 
Features:
•  Smooth & Clean Hair Cutting
•  Long 3+ Hour Battery Life
•  Fast Charging w/USB Cable
•  Cool Running, Low Noise 
•  Andis T-Blade Compatible
•  Stylish Upscale Look & Feel
•  Very Nice Build Quality
•  Includes Shown Accessories