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: D-Link DI-604 Cable/DSL Router, 4-Port Switch
Product description: DI-604 from D-Link combines the latest advancements in chip technology, low-cost design and manufacturing with new, feature-rich firewall and network management controls to give you quite possibly the most advanced, yet affordable Ethernet router to date. It features an advanced filter which can be activated or deactivated based on your preference to block out unwanted websites. The Network Address Translation allows you to share a single IP address and protects you from outside intruders gaining access to your private network. When you have multiple VPN users on the network, VPN multiple/concurrent session helps you to have better security
Product feature: Easily applied content filtering based on MAC address, IP Address, and/or Domain name, Quickly and easily share an Internet connection with multiple computers, Setup wizard simplifies the installation process, Advanced Firewall and parental control, Built-in 4-port switch
Product price: $1.54
Product brand: D-Link
Target attributes: Modem Type
Answer: attribute: modem type
value: dsl
source: product title