Hello, sir,
there are two kinds of endoscopes, 2M&7M is one kind, 1M & 1.5M & 3.5M is another kind, please read the instructions carefully, choose the right for you!
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A endoscope 2M&7M Features
USB interface:USB 2.0
Camera head outer diameter:7mm
This mini USB inspection camera makes use of optoelectronic technology to investigate hard-to-reach area
This inspection camera has many appliactions including ear detection,oral examination,search and rescue,pipeline inspection,engine inspection,video monitor,sewer pipe inspection,cast mould
High resolution with 1/9CMOS camera
Built-in 6LED light(with brightness control)on camera head to illuminate the inspection area
Waterproof wire endoscope
With a 7mm camera head
Photo shooting and video recording
Specification:
Camera head outer diameter:7mm
Total length : 2M/7M
Pixels:300000 pixles
Resolution:640*480(VGA),30 ftps
LED:6 white LED bright light
Focal distance:6cm-10cm
Waterproof level:IP67
Support systems:Windows 2000/XP/VISTA
Temperature:-20~100
Note:This product does not support the Applle system

Package Included:
1*USB endoscope
1*Mirror
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B endoscope 1M & 1.5M & 3.5M Feature

Endoscope features a lot of functions in our life. If you have a android phone, this endoscope can be used everywhere and everytime you want.
Build in a control button, can capture a image and take a video, and the photos & video file will directly stored in your Android mobile phone, the whole process of record check, convenient observation and follow-up analysis.
There's also a turning wheel used for adjust the brightness of six LED lights so that work in some area without enough light.
Ideal for intraoral camera system, underwater camera, waterproof Micro-cameras, motor vehicle detector, sewer pipeline detector, search and rescue, criminal and custom detector, archaeological detect, the PCB detection, home care, aviation and space industries, care and tractors industries, petroleum drilling industries, constructions and so on.
With a micro to USB line, it can also be used for computers.
Applicable for Android PC Phone & Notebook Etc Device
Specifications:
Camera head outer diameter is 7mm
Total length : 1M/1.5M/3.5M
Pixels: 2MP
Waterproof level : IP67
Resolution: HD 640*480, 1280*720 30ftps
View Angle: 66 degree
Focal distance : 6m
Focal Distance: 4cm-infinite
Diameter: 7.0mm
Light: 6 adjustable withe LEDs
Support Systems: Android/Windows 2000/xp/ Vista/7/8/10

Package Content:
1 x Android Endoscope
1 x Micro to USB line
1 x CD Driver
1 x Magnet
1 x Side Audition
1 x Small Hook
1 x User Manual