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.

Features

 * Battery-powered handheld TV
 * TV channel scan with FM radio
 * Analog and digital TV tuners

Models

 * PTW-100 (1987)
 * PTW-140 (1988)
 * PTW-200 (1990)
 * PTW-215 (1991)
 * PTW-230 (1993)
 * PTW-250 (1996)
 * PTW-290 (1997)
 * PTW-310 (1999)
 * PTW-360 (2002)
 * PTW-410 (2005)
 * PTW-430 (2006)
 * PTW-450 (2007)
 * PTW-490 (2009)
 * PTW-500 (2010)
 * PTW-520 (2013)
 * PTW-550 (2015)
 * PTW-600 (2018)