GVM BI-672 is the upgrade version of GVM520S
 there is 672pcs LED bulb compared GVM520S only 520pcs, and it is brighter. Same function as following: Multi-function control: Master/ Slave and 12 channels function: you can set 12 different channels, and each channel can control more than 10 pcs GVM same series of video light. Only need to choose one video light in master mode, and others in Slave mode. That means you can control about 120 pcs video light. Please note: this wireless remote function only applies to the " GVM series video light. " GVM 520S, GVM672S" etc. User-defined 4 group parameter: you can define 4 different group brightness and color temperature. Rotate the knob to set the brightness and color temperature you need, and press the collected button (1,2,3,4 ) 2 seconds, then will display collected !! You can use these 4 group parameter directly when you want to use next time, and no need to set again. Very convenient for your work. 
Packing lists
GVM BI-672 Bi-Color LED Video 1-Light Kit
1 x GVM BI-672 Bi-Color LED Panel 
1 x Diffusion Filter
1 x Stand Diffuser
1 x Four-Way Barndoors
1 x AC Adapter
1 x Power Cable
1 x Carry Case
Note: single light without light stand.
GVM BI-672 Bi-Color LED Video 2-Light Kit
2 x GVM BI-672 Bi-Color LED Panel 
2 x Diffusion Filter
2 x Bracket Soft Filter
2 x Four-Way Barndoors
2 x AC Adapter
2 x Power Cable
2 x Light Stand
1 x Wireless Remote Control
1 x Carry Case
GVM 672S-B Bi-Color LED Video 3-Light Kit
3 x GVM-BI-672 Bi-Color LED Panel 
3 x Diffusion Filter
3 x Bracket Soft Filter
3 x Four-Way Barndoors
3 x AC Adapter
3 x Power Cable
3 x Light Stand
1 x Wireless Remote Control
1 x Carry Case