Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Does this extender can extend both bands at the same time? I 've a dual band router and need to extend both networks
Document: This Dual Band Wi-Fi Range Extender deserves the five stars. According to its name, the Extender is what you need to provide Wi-Fi in a multifloor house. I followed instructions provided. By wireless connecting my MacBook Pro computer in the same room where the router resides, the software of the AC1200 appeared. Continuing its directions, naming the two bands, and moving to the second floor, the Wi-Fi permeated the house.
Random note:  Since I had gotten theNETGEAR Nighthawk AC1900 Dual Band WiFi Gigabit Router (R7000)the signal from that router was so powerful the devices fell back to the router and I did not notice the extender had dropped for a day or two (weak signal problems started cropping up). It would seem that a few people who buy theNETGEAR Nighthawk AC1900 Dual Band WiFi Gigabit Router (R7000)may no longer have a need for an extender depending on your individual setup.
I replaced my dual band 80211 n router with a netgear 80211 a/c router. At the same time, I wanted to replace the dual band "n" extender with a comparable a/c extender. With the old system and all components in exactly the same location, I was able to attain download speeds consistently in the 20 Mbps range with devices plugged into the extender. With the all new equipment speeds dropped to between 2 and 3Mbps.
You will probably have both. These are the networks for your extender.8. Connect wirelessly to one of these two networks with your device. You will need to input the password for your router when connecting to each network. The password on the range extender networks and your main network are the same.9. To maximize my options, I connected to one of these networks, and then to the other.
I live in an apartment with a lot of other networks, right on top of each other. This makes my speed slow and unreliable. So as I know? This is the only extender that features both 2.5 Mhz and 5 Mhz band and, this is important, a feature to stream from one device at the 2.5 Mhz N-Band through the extender and out to the 5 Mhz AC band to the AC router.
I must say this is the best extender I have ever owned and I have owned almost every brand due to the layout of my home. The power and coverage was surprising to say the least and the throughput if you use the Fastlane Technology which basically allows the extender to use one of its dual bands to communicate with the router exclusively (this is NOT a default you have to use the setup menu to set it up).
I am a fan of all NETGEAR products. I particularly wanted this Range Extender, as it is dual band, and my router is a dual band router. Easy to install and it popped right in. It is as described. I will use this seller again! Arrived very quickly!
The extender is in the upstairs (ground floor) laundry room on the southeast side of the house (no second floor) and covers the outside area with ease. I've used both the regular extended bands and the FastLane feature (2.4 GHz to devices/5 GHz to Router) and both modes worked great. There is a small hit on the 2.4 GHz band signal emitting from the router (separate SSID) when using FastLane but not enough for concern.
Best extender, Access Point ever.Dual Band, Highest throughput.Simple set up. Using as access point for Cat6 cabled VOIP phones to convert to wireless signal to join Wired Router/Network across the street.Joining remote wired printers and computers as well aswireless devices to Secure Network across the street as well.
The ease of use and powerful radio make this a pretty good deal. It is a lot less expensive than the Airport Extreme as well. If you nee to extend the wireless and have no wired option this is a really good device to get. I would recommend this product to my friends and family if they need an extender.
Answer: It can but will reduce the wifi preformance