There are physical stores in Shanghai
Pentax Pentax TR power back3 flash external power supply, complete package
Pentax/Pentax TR power back3
AF540FGZ II flash for the first and second generations
Using 6 batteries can effectively shorten the flash interval and extend the number of flashes.
Full flash can reach 4.5 second interval, 700 flashes
![](https://img.alicdn.com/imgextra/i3/53338931/TB2o6kYaFXXXXXzXXXXXXXXXXXX_!!53338931.jpg)
![](https://img.alicdn.com/imgextra/i3/53338931/TB2IRcPaFXXXXXPXpXXXXXXXXXX_!!53338931.jpg)
![](https://img.alicdn.com/imgextra/i3/53338931/TB2t0MSaFXXXXcOXXXXXXXXXXXX_!!53338931.jpg)