The 9v battery is a heavy duty battery that is used for garage door opener remotes and keypads. The 9v long life battery last longer than standard batteries. Various battery brands are used.
Use with Linear remotes: DTA, DTC, DTD, DT-2A, DT2D, DT4A, DT-4D, DT3+1
Use with Linear remotes: DNT00002, DNT00002A, DNT00017A, DNT00027A, DNT000127B