Material of Macro Tube: The part of camera mount and lens mount are both made of high quality brass, while the tube is made of high quality ABS plastic. Extension tubes of 11mm and 16mm lengths can be used individually or in combination for greater magnification
Function of Macro Tube: Shortens minimum focusing distance of lens for macro photography, convert almost any lens into a macro lens, save your cost of buying an expensive macro lens
Radio Wireless Connection: It works from behind the camera as well as from in front, not having to be in direct line of sight to the camera like an infrared (IR) remote, so it is much more flexible and convenient than IR remote control
Function of Remote: Can wirelessly trigger the camera shutter under 5 modes: single shot, unlimited continuous shots, bulb shot, 3 continuous shots and 5 seconds delay shot. (Note: It's not able to control video start and stop)
Woking Distance of Remot: Operates on radio frequency 433 MHz, can trigger cameras wireless or wired, wireless range up to 30 meters / 100ft. 16 possible radio channels, 1 transmitter can trigger multiple receivers