A V40-104 stand alone mains powered DSB modulator. For modulation of any audio/video source such as a security camera, VCR, or Set Top Box. Double SideBand (DSB) type. Simple front panel controls enable full adjustments and can be locked to prevent tampering after installation. Clear display shows the settings. Configurable to Channels 21-69 and PAL- I/G/H/K/M/M. Audio and RF output level can be controlled. Maximum Output is 85dBµV.