Since this model is extremely popular, the market is flooded with variations and "clones." Here is how to handle the RF-609 with care:
Avoid Overcharging: Most older RF-609 units do not have "smart" charging. Leaving it on the dock for days can degrade the Ni-Cd/Ni-MH battery. Unplug it once the 8-hour window is up.
Original vs. Fake: Genuine Dingling trimmers usually have a heavier weight, a more metallic finish, and a distinct "serial number" or holographic seal on the box.
The "Pro" and "S" Versions: Note that there are newer versions like the RF-609 Pro or RF-609S which feature Lithium-ion batteries (3-hour fast charge) and digital displays. If yours has a simple red LED, it is the classic version
