Feature: It achieves stable, reliable, and effective real-time signal transmission, a good choice for photographers who have various lighting demands. All the groups and function buttons feature backlighting, easy to be operated even in a low-light environment.  The newly added scan setting function can help automatically detect the channel with the least interference. Support firmware upgrade via Product Category: Wireless Flash Trigger.  Compatible Cameras: For Nikon/Sony/Canon/Olympus/Fujifilm/Pentax cameras(TTL autoflash);  Compatible Mobile Phone: For iPhone, Huawei, Samsung (Please refer to the compatibility list on the manual to know more about the compatible models.);  Power Supply: 2 x AA battery(battery is not included);  TTL Autoflash: i-TTL;  Flash Exposure Compensation: +-3 stops in 1/3 stop increments;  Wireless Shutter Release: The receiver can control the camera shooting via. 3.5mm sync cord jack;  Zoom Setting: Adjust the focal length of the flash through the transmitter;  Firmware Upgrade: Support program firmware upgrade via. Type-C USB cable;  Memory Function: As long as 2 seconds after setting parameters, the parameters will be remembered, and the original data will be recovered once restart;  Wireless Transmission Range (approx.): 0-100m;  Built-in Wireless System: 2.4G wireless transmission;  Modulation Mode: MSK;  Channels: 32;  Wireless ID: 01-99;  Groups: 5;  Display: Large LCD panel, backlighting ON or OFF;  Item Size: 7.2 x 7 x 5.8cm / 2.83 x 2.76 x 2.28inch;  Item Weight: 90g / 3.2oz;  Package Size: 10.8 x 10.5 x 7cm / 4.3 x 4.1 x 2.8inch;  Package Weight: 180g / 6.3oz;  Package Included: 1 X  TTL Wireless Flash Trigger;  1 X User Manual;