This is the 3rd Generation iPod touch. It was announced on September 9th, 2009. It makes internal improvements over the previous generation; adding a faster processor, doubling the RAM, increasing storage capacity, etc. The name used in firmware is iPod3,1.
The iPod touch (3rd generation) uses the BCM4329 for Wi-Fi (802.11 b/g) and Bluetooth 2.1. The chip includes 802.11n and FM transmit/receive support, but these capabilities have yet to be enabled by Apple or jailbreakers.
Size: 4.3 inches (110.0 mm) (height), 2.4 inches (61.8 mm) (width), 0.33 inches (8.5 mm) (depth)
Weight: 115 g (4.05 oz)
Battery: 30 hours of audio, 6 of video