Check the SN info on the device Hollyland Support November 29, 2022 01:41 Updated OVERVIEW: Each unit of the Hollyland device has a certain and unique series number. The following is the SN schematic diagram of the Hollyland product. Series Number: 002145T E00992D Wireless microphone RX (receiver) and TX (transmitter) Charging Box Wireless Video Transmission System TX (transmitter) and RX (receiver) Wireless Intercom System Belt pack Base Station Related articles Delay Test User Manual Frenquency Chart of Hollyland Wireless Video Transmission System MARS 400S Guidance With Panasonic GH4 Cascade---Solidcom M1 Comments 0 comments Article is closed for comments.