"The RadioPopper Jr2.... The RadioPopper Jr2 is a complete ground up redesign of the RadioPopper Jrx. It is a huge improvement quality, usability and features. The Jr2 Transmitter supports 4 groups that can be instantly toggled on and o with buttons at the front of the unit. The buttons are lit allowing the photographer to easily see what groups are toggled on and which groups are being adjusted. A single dial allows for stop accurate control of lights andstrobes. Groups can be adjusted one at a time or all at the same time. Power can be adjusted in 1/3rd or 1/10th stop increments over 9 stops. The Jr2 Transmiter can act as a remote trigger by receiving remote triggering commands then ring the user's camera and lights. The display is small enough to keep the Transmitter compact and low pro le while still large enough to clearly indicate the power levels of all lights. Thedisplay also includes a backlight that works automatically. The Jr2 Transmitter is reverse compatible with all existing RadioPopper products and gives stop accurate control of Alien Bees and speedlights when paired with the new Jr2 Receiver. The Jr2 Transmitter also includes an exciting new feature, a memory function. The user can easily save up to 4 setups to be instantly recalled later. The savefunction remembers what groups are active and at what power levels. It can be used to save location setups or the most common setups in the user's studio. The Jr2|Extremely Easy Use with Multifuction Dial/Buttons|Compact, Low Pro le Design|Stop Accurate Control of up to 4 Groups|Easy to Read Display|Illuminted Display and Buttons on Tx|Save/Memory Function|Remote Camera Triggering|USB Port for Firmware/Feature Upgrades|AAA Batteries with Battery Level Indicator|Range of up to 1,750 feet|16 Radio Channels|Receiver Built-in Hotshoe, Sync Port and 1/4-20|Compatible with PX, JrX and Nano|Made in the USA"