EXFO America Inc. GP-100 Batteries 9V (package of 10)Available for the following current units: - FLS-110And also available for the following obsolete units: - BRT-320A - FLS-130A - FLS-210A - FLS-210B - FLS-230A - FOS-120A - FOT-10A - FOT-20A - FOT-90A - FOT-920 - FTB-100B