The EnGenius ESR-600H is a step up in the product line, but the price is more than double that of the 300H. The 600H is significantly larger, has more powerful antennas and more connectors. On the back there are four LAN ports, a WAN port and a USB port. Here you can connect external hard disks or USB sticks that accessible to devices within the network. Again the WPS button is on top of the router.
When you remove the top of the router, you can see that EnGenius did not use Realtek chips but a combination of Ralink and Atheros. The switch comes from Atheros (AR8327), while the CPU and the wireless chip are from Ralink, the RT3662F and the RT5392L, respectively. The RT3662F also provides the 5 GHz band, and the RT5392L creates the 2.4 GHz band. The two external antennas are there for 2.4 GHz, and the internal antennas are connected to the 5 GHz frequency.