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Title: Vello BG‑S7 Battery Grip  
Category: Accessories  
Brand: Vello  
Description: Dual‑battery grip for Sony A7R IV, A7S III, and A9 II that doubles battery life and adds vertical shooting controls.  
Details: Features a rubberized nonslip handle, alternate shutter release for portrait mode, front/rear dials, C1/C2, AF‑ON, AEL buttons, a Multi‑Selector joystick, and a 1/4‑inch tripod socket with strap

Price is $