10-30x 50mm High Power Monocular Bossdun monocular for adults, a high power monocular telescope with 10-30x adjustable magnification, gets you closer to the distance better. Besides, a 50mm objective lens (eyepiece: 22mm) on this monocular has an incident light area 45% larger than 42mm objective lens, providing a large field of view (up to 130m/1000m). An ideal monocular for camping, bird watching, concerts, sport events, landmarks, scenery, etc.Adjustable Phone Holder The Bossdun 2021 latest phone holder included, suits for almost all smartphones, such as iPhones, Samsung, Sony, LG, HTV, etc. Hook it up to your phone and can get great shots. Now, with the monocular with smartphone, you could share the beauty you have captured with your families and friends.High Contrast & Resolution Image The BAK-4 prism and FMC (Fully multi-coated) lens on our zoom monocular, guarantee that the light transmittance reaches up to 99.7%, which can deliver a bright, sharp and crystal image. With the reduction of glare and double image, you wont feel dizzy and will have a comfortable view for a long time.Humanized Design This star-scope monocular telescope, measures 20x8x6.5cm and weighs only 248g, quite comfortable to hold and focus with one hand. An adjustable eye-cup twists up and down for comfortable viewing no matter with or without eyeglasses. With your hand holding the monocular, the anti-slip rubber armor and attached wrist strap will protect your monocular from dropping.