Dual frequency conversation control.bag length can be set and cut in one step, saving time and film. lterface features easy and quick setting and operation.Self failure diagnosis, clear faliure dispaly.High sen sitivity pho to electric eye color tracing,numerical input of cutting sealing position for extra accuracy.Temperature independent PID control more suitable foer packing different materials.Positioned stop function,without sticking knife or wasting film.Simple driving system,reliable working,convenient mataintance.All control is realized through software,easy for function adjusting and technical upgrade.