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: HTC One E8 M8Sw 5.0" Android 4.4 Quad Core ROM 16GB Dual Sim Multi-language Unlocked 4G LTE Smartphone Color Grey - International Version No Warranty
Product description: HTC One E8 Size:146.42x70.67x9.85mm Weight: 145 g Display: 5.0 inch 19201080(FHD,1080P) CPU : Qualcomm 801 2.5GHz Quad-core CPUsPlatform Android: Android 4.4 HTC BlinkFeed Dual Sim SIM Card Type Nano-sim Network Sim 1 2G:GSM 850/900/1800/1900 3G:UMTS/HSPA 900/1900/2100 MHz 4G:LTE 1800/2100/2600 MHz Sim 2 2G:GSM 850/900/1800/1900 ROM: 16GB RAM: 2GB Expansion card slot supports microSD memory card for up to 128GB additional storage (card not included) GPS Internal GPS antenna + GLONASS Sensors: Accelerometer Connectivity 3.5 mm stereo audio jack Bluetooth 4.0 Wi-Fi: IEEE 802.11 b/g/n Camera 13.0MP back camera, front camera 5.0MP with fixed focus 1080p Full HD video recording Multimedia Audio supported formats: Playback: .wav, .mp3, .xmf, .amr, aac .wma (Windows Media Audio 9) Recording: .amr, .aac Language: English, Chinese. Video supported formats: Playback: .mp4, .wmv (Windows Media Video 9), H.263, H.264 Recording: .mp4, H.263, H.264, Battery Capacity:2600 mAh Talk time: Up to 13.7 hours for 3G Up to 16 hours for 2G
Product feature: Android 4.4, HTC Sense 6.0, Google Play, Dual Sim, SIM 1: 4G: FDD-LTE：1800/2100MHz TDD-LTE：2600MHz 3G: UMST/HSPA 900/1900/2100MHz 2G: GSM/GPRS/EDGE 850/900/1800/1900MHz SIM 2: 2G: GSM/GPRS/EDGE 850MHz/900/1800/1900MHz, Front Camera 5.0 MP, Back Camera 13.0 MP, Display: 5.0-inches, RAM 2GB, ROM 16GB, up to extend to 128 GB, Supports English,Portugues, Italian, Arabic,ect, This cell phone may not include a US warranty as some manufacturers do not honor warranties for international version phones. Please contact the seller for specific warranty information.
Product brand: HTC
Target attributes: Rear Camera Resolution
Answer: attribute: rear camera resolution
value: None
source: None