Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: UHAPPY UP520 Unlocked Android 4.4 3G IPS 5.0" Smartphone MTK6582 Quad Core 1.3GHz 1GB+8GB Dual SIM 5.0MP+8.0MP Dual Camera GPS WIFI (Black)
Product description: Features: 1.Android 4.4 operating system with 1.3 GHz MTK6582 Quad-core processor and 1 GB RAM +8GB ROM 2.Support 2G network: GSM 850/900/1800/1900MHz 3.Support 3G network: WCDMA 850/1900/2100 MHz 4.QHD G+F+F ips 5.0" multi-point capacitive touch screen with 540X960 Pixels resolution 5. 5.0MP front camera and 8.0 MP rear camera 6.Supports Wi-Fi, G-sensor, Bluetooth, GPS and FM radio,OTG 7.Supports an external TF card up to 32GB 8.Gesture control 9.Double-click to open or close the screen 10.Quick start your device by making specific gestures with your finger over the off screen Description: Dual SIM Dual Standby experiencing dual life. Specifications: Bluetooth: V4.0 Supported Video Formats: 3GP/MP4/H.263/H.264 Operating System:Android 4.4 CPU:MTK6582 quad core 1.3GHz GPU:Mali - 400 MP Java Supported:NO TV:NO Wi-Fi:802.11b/g/n GPS Supported:Yes (map is not included) OTG:YES OTA:NO NFC:NO Built-in Games:NO Data Interface:Micro 5pin Proxy-sensor:Support Light-sensor:Support G-sensor:Support Gyroscope Sensor: NO Compass Sensor: NO Temperature Sensor: NO Humidity Sensor:NO Barometer Sensor:NO Gesture Sensor: NO Card Slot:External T-flash card up to 32GB Card Included:N/A Battery:2200 mAh battery Charger:100-240V
Product brand: Uhappy
Target attributes: Lens Quantity
Answer: attribute: lens quantity
value: dual camera
source: product title