Identify the following items from the user's historical click behavior:
- The user's preferred product categories
- The user's attribute preference for each category

The user's historical click sequence is delimited with triple backticks in order of time from far to near. Format your response as a JSON object with "Category" and "Attributes" as the keys. 
If the information isn't present, use "unknown" as the value.

User's historical click sequence: ```
[1] 2018 Cheap 3500mah Battery Charging Case for iPhone 7
 - Dimension: 148.2*74.35*14.85mm; NAME_1: 90g; Capacity: 3000-4000(mAh); Socket Type: Light; Type: PORTABLE,Portable power station; Battery Type: Li-Polymer Battery; Output Current: 5V-1A; Features: Back clip-on,portable; Function: charger case; Supports Solar Energy: NO; Input Current: 5V-1A; Support: For iphone6-7-8,6p-7p-8p; Is LED Lamp Illumination: Yes; Output Interface: Apple Interface; Brand Name: OEM; Model Number: PW-7; Input Interface: NAME_2,Apple Interface
[2] wholesale 3300ml portable mini 7 color ultrasonic air aroma humidifier with led color light h2o aroma diffuser air humidifier
 - Capacity: 3000ML; Type: Ultrasonic Humidifier; Installation: Tabletop / Portable; Humidity Control: Humidistat; Material: ABS; Brand Name: Accept OEM; Model Number: A12; Voltage (V): 5; Power (W): 3; Mist Output (gallon / day): 80ml/H; App-Controlled: Yes; Private NAME_3: Yes; Power Source: usb,Electric; Application: Car,RV,Outdoor,Hotel,Garage,Commercial,Household; Noise: <36db; Timing Function: No; NAME_4 Provide two versions of response separated with exactly 6 asterisk symbols: ******.
user