Flash units are commonly built directly into the camera. In addition, many cameras allow separate flash units to be mounted via a standardized accessory mount bracket often called a " hot shoe". In professional studio photography, flashes often take the form of large, standalone units, or studio strobes, that are powered by either special battery packs or connected directly to the mains and synchronized with the camera from either a flash synchronization cable, radio transmitter, or are light-triggered, meaning that only one flash unit needs to be synchronized with the camera, which in turn triggers the other units.
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