They are a pair of MC4 3-in-1 branch connectors.  They are perfect for combining multiple solar panels together, providing a quick and easy parallel wiring solution for solar panels.  Dust free and water proof!

1) Housing: 100% GE PPO                                        

2) Degree of protection: IP68 (the highest protect level, dust proof and water proof that can withstand water immersion to a depth of 6.6 feet for 60 minutes.)                         

3) Contact resistance:0.5mΩ

4) Contacts: Copper: Silver plated

5) Flame class: UL94-V0

6) Pin dimensions: Ø4mm                                      

7) Wire size range: 2.5~6.0mm²