released on May 3, 2007, is a small and screenless 1 or 2 GB player. Coated in glossy plastic, the player is available in black, white, blue, pink, green, and red. The ZEN Stone is compatible with the MP3, WMA, and Audible formats, is UMS compliant, and the battery lasts up to 11 hours. Although it is slightly larger than the ZEN Stone, the ZEN Stone Plus is identical in design. However, the ZEN Stone Plus has a monochromic OLED screen, a built-in FM tuner, a stopwatch (the first ZEN player to have this ability) and a built-in microphone. The ZEN Stone Plus plays approximately 9.5 hours of continuous audio playback, and comes with the same colors as the ZEN Stone in a 2 GB capacity. A 4 GB model was subsequently released on June 29, 2007. A built-in speaker version was also released. Both versions support MP3 and WMA, with the built-in speaker version also supporting iTunes-encoded AAC and Audible formats. A successor called the Zen Krystal was presented in 2008, featuring a pedometer. ZEN Wav The ZEN Wav was released on May 25, 2007. The flash-based player has built-in stereo speakers and supports the MP3, WMA, and WAV formats. It is the first player in the ZEN line to have the following features: a 16-bit color screen, unlike other ZEN players, which are 8-bit; a battery life of 30 hours (20 with the speakers), which was the longest than any previous ZEN player; the ability to read e-books; and the ability to show 3 different time zones "at a glance". The ZEN Wav comes in capacities of 2 and 4 GB. ZEN V/ZEN V Plus Creative's first flash-based portable media player was released on June 20, 2006. The scratch-resistant models have an OLED display with a resolution of 128×128. They come in white and black with orange trim for the 1 GB version, green trim for 2 GB, and black with blue trim for the 4 GB version and later an 8 GB version. The ZEN V Plus plays video and has an FM tuner, while the ZEN V does not. The players support the same formats as the Vision:M, while the videos will be trans coded upon transfer. There are also built-in microphones for voice recording, as well as wires for line-in recording. The rechargeable lithium-ion battery has a life span of up to 15 hours of