Portowatch

Portowatch is a series of portable DVD/Blu-ray player and pocket television combined devices that come with NTSC, PAL, ATSC, ISDB-T or DVB-T tuners created and marketed by Theorysonic. It is the first pocket handheld TV to have market success.

History
Theorysonic had developed to watch TV outside the house with handheld TV. The first Portowatch digital TV model with tuners was released in 2002, and HD model with live awas released in 2005. Portowatch digital TV dongle was first released in 2005.

Features

 * PTSUG-based software (since 1999 models)
 * Battery-powered handheld TV
 * TV channel scan with FM and AM radio
 * Analog and digital TV tuners
 * TheoryMedia player app (since 2002 models)
 * Live TV Channels and applications (since 2005 models)

Models

 * PTW-100 (1987)
 * PTW-140 (1988)
 * PTW-200 (1990)
 * PTW-215 (1991)
 * PTW-230 (1993) - First model with recording and streaming
 * PTW-250 (1996)
 * PTW-290 (1997)
 * PTW-310 (1999) - First Portosic OS-based model, with limited digital TV
 * PTW-360 (2002) - First full digital TV model
 * PTW-410 (2005) - First HD model with live TV and applications
 * PTW-430 (2006)
 * PTW-450 (2007, 4.5", 16 or 32 GB models for apps and media)
 * PTW-490 (2009)
 * PTW-500 (2010)
 * PTW-520 (2013, 5.7", 32, 64, and 128 GB models for apps and media) - First 4K Ultra HD model with videos
 * PTW-550 (2015)
 * PTW-570 (2017, 6.0", 8.0", and 10.1", 128, 256, and 512 GB models for apps and media) - First model with NanoFlash memory card slot
 * PTW-600 (2018, 6.0", 8.0", and 10.1", 128, 256, 512 GB, and 1 TB models for apps and media)