... , Tow compressors parallel connection, to reduce noise and improve the cooling temperature come to -86 steady. 9. 2-4 hours come to ... page 14, Audible and visual alarm: High or low temperature alarm, Power failure alarm, Low battery alarm, Door ajar alarm, Filter blocking alarm ... . Certificate: CE mark for DW-HL328/538, ISO9001, ISO14001,ISO13485 20. Power supply: 220V /50Hz 1 phase, can change as 220V ...