Features: 1-Trigger-2 Universal for Smartphone Camera: Perfectly support two transmitters and one receiver work simultaneously, universal for camera and smartphone. 12 Channels and 194ft Wireless Range: 12 channels each for A and B Group. When there is interference from other channels, you can switch the channel. The unobstructed effective distance can reach up to 197ft, and obstructed distance can reach 98ft. Power by Built-in Lithium Batteries/ External Power Supply: The CVM-WS60 COMBO is powered by built-in lithium batteries/ external power supply. Flexible Built-in Smartphone Holder Design: Built-in retracted smartphone clamp, it\'s convenient for storage; Adjustable smartphone clamp width, suitable for all types of smartphone, flexible and convenient. Lattice LCD Display: With high resolution, low power display will hardly affect the whole standby time. The icon and font on the screen are concise and clear, and the running status of the equipment can be monitored in real time. Other Features: M/S switch, 10-levels gain adjustment, muting functions, real-time monitoring, volume dynamic monitoring.