Full multilayer coating high quality eyepiece, can zoom to any focal distance between 7mm to 21mm, choosing best magnification for your subject. | For viewing moon, planets, nebulae, star clusters and other heavenly body landscape and astronomy observation, high dispersion, wide field of view, very comfortable. | Fine workmanship, suitable for 1.25 inch /31.7mm astronomical telescope. | Zoom eyepiece not just eyepiece, high magnification to low magnification, short focal distance to telescopic, easy to adjust proportion, very practical. | Professional manufacturing, metal body, surface coating, excellent optical performance.

37mm 0.25X additional lens with super fisheye effect, wider picture range. | Suitable for all 37mm caliber camera lens, strong applicability. | Lens can divided into two parts, macro lens alone using has 12.5 times magnification effect, suitable for macro close-up shooting. | Made of high quality aluminum alloy and optical glass material, sturdy, durable and long service life. | Small size and lightweight, easy to carry and store, convenient to use.

【Single Ear-hook Business Headset】 In ear-hook type, headset is easy to use and comfortable to wear, which is practical. | 【Adjustable Volume + Mute Control】 Plug and play, USB headphone supports one-key mute, which also supports volume adjustment. | 【Comfortable to Wear】 Compact appearance, human engineering design, Can be uninterruptible using.The headset clip can be stretched freely and comfortable wear. | 【Wide Application】 And this notebook headset is suitable for Skype / for QQ / for MSN and other online language chat software. Meanwhile, ear-hook headset is suitable for online game headsets used by gamers. Suitable for desktop computers, notebooks, this kind of headphone is entitled with high performance according to strict rule. | 【Noise Reduction Mic】 Superior Quality Sound with the flexible adjustable microphone can meet your needs.PC Headset helps you be heard more clearly and get closer to your customers and enjoy high-quality calls.

The GPIO cable can be connected to a 3.5 inch display for easily use | Professional designed for Raspberry Pi male to female GPIO cable | Possess 20cm length and 40pin in total, enough to meet your demands | This cable wire can be used to extend the GPIO of for Raspberry Pi | GPIO wire can be connected to T board, breadboard and other operations

The focusing helicoid adapter is the best choice for magnifying or altering lenses. It provides a focus system for lenses without a focus system. | It can also be used as a macro tube to provide fine focus control for macro photography. | The length of the focal length is 25mm/1.0in(min) to 55mm/2.2 in(), providing a 30mm/1.2in adjustable distance for lens focusing. | Made of aluminum alloy, black anodized, long service life, very good hand feel. Use universal M65 threaded interface, strong versatility and convenient transfer. | The inner wall of the focusing helicoid tube is matted to avoid the influence of reflected light on imaging. The focusing helicoid tube can make the idle old lens can also be used for digital camera shooting.

Made of quality aluminium alloy material, high strength, anti-deformation, anti-rust, durable. | Can be expanded camera adapter, convenient to use. | Lightweight and compact size, easy to carry and store. | Telescopic extension tube, can be adjusted according your need. | Suitable for astronomical telescope.

USB to 1284 print cable is a high-speeded conversion adapter cable designed for parallel printers. | Suitable for notebooks and desktops, and through parallel cables, parallel port printers can communicate directly with computer USB interfaces. | Widely used in home, study, living room, bedroom, office, business, conference, education, entertainment and other places. | Support for Windows 98 / for 98SE / for ME / for 2000 / for XP / for VISTA WIN7 or higher operating system. | The printing speeded is greatly improved, and the USB port is hot-pluggable, which is very convenient to use.

(long range transmission)Stable wireless connection function, effective control range up to 10meter. | (Ergonomic and quiet)The numeric keyboard uses the mute button to create a quiet typing environment for you. | (Low power consumption) strong battery life up to 12 months, long battery life. | (2.4GHz wireless connectio), 18-key design, with backspace key, you can easily correct the text. | (wide compatibility)System requirements for Windows XP/Win7/Win8/Win10/for IOS, with strong adaptability. | Connectivity technology: Radio Frequency

This sound card uses CMI/HT8738 chip. The chip's signaltonoise ratio reaches 120dB, PCI plugandplay interfacefull duplex playback and recordingHRTF 3D spatial positioning sound effects, supports dircet sound 3D and A3D interfaces. | Support for Windows 98 / for Windows2000 / XP / NT signal voltage (0.5V~5V). | Support 4channel surround sound output, support DLS sound library technology, support A3D 1.0 and DS3D, compatible with DirectSound 3D and EAX sound effects. Supports 24bit SPDIF, OUT and SPDIF IN at the same time, and supports optical fiber input and | This card supports music synthesizer, traditional sound card, and supportsfull duplex playback and recording. | Support Direct Music SPDIF digital audio indicators: 24bit stereo, 44KHzsound sampling recording and playback, 120dB sound quality full duplex playback recording.