The flash devices M500 & MB500 operate perfectly with the Priolite radio control, which can be fixed on the Hot Shoe of the camera. Nearly all functions of the flash device can be controlled on telecomm&. The radio control displays the power setting of the device & its readiness. By organizing in 4 teams, each with 9 devices, in total 36 devices can be individually controlled. The system operates in a frequency range of 2.4 GHz, which is worldwide approved for these applications. The radio control works with 3 AA-batteries.