HK BAILING (Hongkong Bailing International Co., Ltd), Located in Shenzhen,China,specializing in M2M Modules and Terminals , bulk sms modem,alarm system enable always-on cellular communications for virtually any IoT or M2M applicationa, bulk sms/voice/calls device and security system. Their rugged design, unparalleled engineering and manufacturing standards make them reliable in the most extreme environments and over the long life of your M2M solution and bulk sms/voice/calls broadcast system and security system.