Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Sylvania 6620LE 20-Inch Flat-Panel LCD TV
Product description: With a picture that's as crisp and clear as it is vibrant and dynamic, Sylvania's 20-inch 6620LE LCD television is perfect for use with progressive-scan (480p) video signals like those from many DVD players and satellite receivers. It also happens to accommodate full 1080i high-definition TV signals from DTV set-top boxes, letting you enjoy great picture quality in your kitchen, bedroom, or office without sacrificing a whole wall to a bulky TV or monitor. The 6620LE offers a 10.6-inch profile and an internal NTSC tuner for convenient broadcast-television viewing with features like auto channel setup, V-Chip parental controls, SAP (second audio program), and closed-caption decoding. Image quality benefits from a 3-line digital comb filter (which removes blurred edges between colors and reduces "dot crawl") alongside the set's native high brightness (500 candles/square meter), a high contrast ratio (500:1), and wide (170 x 155-degrees) viewing angles. The main benefits of an LCD screen include the crystal clarity of images and their compact form. And, like all LCDs, this unit is immune to the distortion and negative color balances one may encounter when using a conventional CRT television near fluorescent lighting or speaker systems. Two elliptical speakers radiate stereo sound from either side of the screen. For connections, you get 1 each composite- and S-video inputs for your DVD player, VCR, or other audio/video device, and a set of component-video inputs for your progressive-scan DVD player or DTV set-top box. The onboard 181-channel tuner offers PLL frequency-synthesized tuning, picture controls (contrast, brightness, color, tint), and you can access its handy onscreen menu from the TV's front panel or from the supplied full-function remote control. Auto sleep timer/power off saves energy after a preset period of inactivity, while resume power-on will recall the set's power state following a brief power outage. The 6620LE is Energy Star-compliant. What's in the Box TV, remote control, remote batteries, a user's manual, and warranty information.
Product feature: Slim-profile LCD television compatible with 480p/1080i video signals; 24.5 x 19.2 x 10.6 inches (W x H x D), High (500 cd/m2) brightness, high (500:1) contrast ratio; wide viewing angles (170 by 155 degrees, horizontal/vertical), Includes 181-channel NTSC tuner and a 3-line digital comb filter to remove blurred edges between colors, MTS/SAP stereo sound with 2 elliptical speakers; RF, composite-video, S-video, and component-video inputs, Full-function remote control, V-Chip parental controls
Product brand: Sylvania
Target attributes: Screen Form
Answer: attribute: screen form
value: flat
source: product title