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: Cheerson CX-20 Auto-Pathfinder 2.4GHz 4CH 6-Axis Gyro RC Quadcopter with GPS and Headless Mode
Product description: Features: Attractive and highly integrated design. Read to fly design. Contains remote control unit. (Just add 4 x AA batteries). Stable, yet agile performance, easy to fly. Two flight control modes, including position hold. Intelligent orientation control (IOC). Failsafe & auto go home/landing. Low voltage protection. Maximum flight speed 10m/s. High intensity led lights, to aid orientation during flight. Gopro camera mount (camera not included). 10 to 15 minutes of flight time. Functions: GPS hold system, auto-return, up and down, forward and backward, side-flying, left and right turning, hover. Specifications: Brand name: Cheerson Model NO.: CX-20 Item type: quadcopter Colour: white Material: ABS Controller mode: Mode 2 Channels: 4 Channels Gyroscope: Six axis Remote control frequency: 2.4GHz Motor: Brushless motor Functions: GPS hold system, auto-return, up and down, forward and backward, side-flying, left and right turning, hover. Remote distance: about 300m Suitable ages: Above 14 Years old Remote Controller Battery: 4 * AA Battery (not included) Charging voltage: 110-220V Battery power: 11.1V 2700mAh Battery type: Li-ion battery Charging time: About 120 minutes Working time: about 15 minutes Item dimensions: 30 * 30 * 20cm (with landing gear) Item weight: 755g (without battery)
Product feature: Cheerson CX-20 Auto-Pathfinder 2.4GHz 4CH 6-Axis Gyro RC Quadcopter with GPS and Headless Mode
Product brand: AUOU
Target attributes: Number of Channels
Answer: attribute: number of channels
value: 4 channels
source: product description
attribute: number of channels
value: 4ch
source: product title
attribute: number of channels
value: 4ch
source: product feature