Metabones EF-BMPCC4K T Speed Booster Ultra 0.71x what kind of battery_Lithium with good bellows

with good bellows

Interior dimensions are approximately 30x30x10cm

This complete kit includes two heads

and solid locks

Metabones EF-BMPCC4K T Speed Booster Ultra 0.71x what kind of battery_Lithium with good bellowsThe Metabones EF BMPCC4K T Speed Booster Ultra 0. 71x is a Speed Booster designed specifically for the Blackmagic Pocket Cinema Camera 4K. Takes Canon EF mount lenses and provides an extra stop of effective aperture, plus a 0. 71x field of view expansion. In excellent condition, with minor cosmetic wear, clean glass, good function. UNBELIEVABLY IMPORTANT: THIS ADAPTER IS FOR THE BLACKMAGIC POCKET CINEMA CAMERA 4K ONLY. DO NOT USE IT ON ANY OTHER