Leica M rear lens cap (Generic) what kind of battery_Lithium Its unique design allows it

Its unique design allows it to remain on the camera in use: it hinges open and closes along with the camera

and an effective image stabilizer

The heads have a 1/4"-20 thread for camera or accessory mounting

It features a trick hybrid electro-mechanical shutter with speeds from 1s to 1/4000s (plus Bulb) and aperture-priority autoexposure

but it can be used with many autofocus lenses which have an aperture control ring (note that the focusing function will still be manual)

Leica M rear lens cap (Generic) what kind of battery_Lithium Its unique design allows itGeneric rear lens caps for Leica M mount lenses, for anyone who's looking for a cap and doesn't care if it says "Leica" on it. Image is for illustrative purposes. Item may differ slightly.