1Specially designed for users to use smartphone to control the font size and color of lines, also support speed adjustment and fast change of turning page 2Comes with 9 adapter rings, fits any camera with lens diameter from 49mm to 82 mm 3The lines of the mobile phone interface are reflected onto the transparent glass mirror of the inscription device, so that the speaker can look at the camera and speak 4The cap cover can prevent objects scratch the glass plate 5Portable and lightweight, good accessory for interview, speech, TV show, etc Features: Specially designed for users to use smartphone to control the font size and color of lines, also support speed adjustment and fast change of turningpage.Comes with 9 adapter rings, fits any camera with lens diameter from 49mm to 82 mm.The lines of the mobile phone interface are reflected onto the transparent glass mirror of the inscription device, so that the speaker can look at thecamera and speak.The cap cover can prevent objects scratch the glass plate.Portable and lightweight, good accessory for interview, speech, TV show, etc. Specification: Material: Plastic + Optical glass Color: Black Remote Control Battery: 2 x AAA battery (not included) Size: Approx. 122 x 110 x 85mm/4.8 x 4.3 x 3.3in Weight: Approx. 541g Package List: 1 x Teleprompter 8 x Adapter Rings (49mm/52mm/55mm/58mm/62mm/67mm/72mm/77mm/82mm) 1 x Remote Control Note:For Andorid smartphone can scan the QR code card in the package to download the APP, for iOS smartphone please search ''BESTVIEW'' on applicationstore todownload app.Use Method: 1. find install the suitable adapter ring on camera 2. install the teleprompter on the adapter ring 3. open the bottom cover of the teleprompter 4. put the smartphone on the bottom cover 5. installation finished