does this have an eyecup or do you just hold it a short distance from your eye? Some review pictures show an eyecup others don't.

There is a molded rubber eye aperture that is removable but not adjustable. It is not a cup per se, it's convex or sort of domed with a peephole aperture.

how is the battery installed?

There's no battery in the monocular itself... it's all manual. If you have the full kit, the special close-up attachment (looks like an inverted eye cup) has a coin-opened hatch for a pair of CR2032 coin cells (not included) to power the 2 illuminator LEDs.

Will this mate correctly with an iPhone 11s

The phone mount is generic. But it's fussy getting it on my Pixel 5.

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VD 4x20 WP Unique 3 in 1 Binoculars, monoculars and Telescope with The Versatility to Capture The Emotion of a Variety of Scenes.

VD 4x20 WP Unique 3 in 1 Binoculars, monoculars and Telescope with The Versatility to Capture The Emotion of a Variety of Scenes.

Product ID: 291518707

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Details

Brand
Pentax
Model name
63600
Eye piece lens description
Experience a
Objective lens diameter
20 Millimeters
Telescope mount description
Altazimuth

🎯16x combined telescope power

💧1M waterproof rating

🔍4x magnification binoculars

Description

🔭 Elevate your perspective—see more, share more, experience more.

ALL WEATHER READY - 1-meter waterproof design means you never miss a shot, rain or shine—built for the adventurous professional.
CLOSE UP PRECISION - Focus as near as 50cm with monocular mode, perfect for intimate scenes or detailed observations on the go.
CRYSTAL CLEAR OPTICS - Fully multi-coated lenses with phase and dielectric coatings deliver bright, sharp, and high-contrast views that reveal every detail.
TRIPLE MODE VERSATILITY - Switch effortlessly between binoculars, dual monoculars, or a powerful 16x telescope to capture every moment your way.
COMFORT MEETS DURABILITY - Rubber-coated body ensures shock resistance and a secure grip, while 19mm long eye relief lets you observe comfortably even with glasses.

The Pentax VD 4x20 WP is a uniquely versatile 3-in-1 optical device combining binoculars, monoculars, and a 16x telescope. Featuring fully multi-coated optics with advanced phase and dielectric coatings, it delivers bright, sharp images with high contrast. Its rugged, rubber-coated waterproof body and long eye relief ensure comfort and durability in all conditions, while a minimum focus distance of 50cm allows for detailed close-up viewing. Ideal for professionals who demand flexibility and precision in their visual gear.

Specifications

Material Type	Rubber
Color	Black
Item Weight	12.16 Ounces
Size Map	Full Size
Exit-Pupil Diameter	5 Millimeters
Water Resistance Level	Waterproof
Focus Type	Center Focus
Apparent Angle of View	1 Degrees
Zoom Ratio	3 multiplier x
Mounting Type	Tripod Mount
Eye Relief	19 Millimeters
Prism Type	Roof Prism
Special Feature	Waterproof
Objective Lens Diameter	20 Millimeters
Magnification Maximum	4
Specific Uses For Product	Hiking and Outdoors

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