Newly developed was so-called cautery pens.
These ball pen-like brand irons run on batteries and with the hot "lead" motives can be branded. Certainly this manner is very disputed, because the machine hasn´t the needed power to achieves acceptable results.
It´s important that you only get a branding of a professional and not try to make it by yourself, then this could obtains involuntary injuries of the skin and unpleasant results.
The healing takes about 2 to 4 weeks and you should use an ointment and never scrape off the arising scab, because otherwise the branding could be "blured". Further you should waive on the visit of swimming baths and lakes to prevent infections. Of course an attentive aftercare must be self-evident in general.
A branding isn´t durable. Usually after about 7 years it fades.