Liftmaster 971lm garage door opener Features and Specifications 1 channel/button transmitter, compatible with models manufactured from 1997-present 390 MHZ Frequency, over 100 billion codes with code rotating technology (Security+) Orange/Amber Color LED LIGHT on back of motor Visor clip and Lithium battery (5 years life w/normal use) included Compatible with ALL Security+ systems, including Chamberlain, Sears, Craftsman and Raynor code rolling residential openers (Safety Signal) Chamberlain 950CB, 953CB, 956CB ^ Sears Craftsman Compatible Model #'s 139.53661 139.53677SRT 139.53661SRT 139.53677SRT3 139.53661SRT3 139.53680 139.53662 139.53681 139.53662SRT2 139.53684 139.53663 139.53961 139.53663SRT 139.53961SRT 139.53664 139.53962 139.53664SRT 139.53962SRT 139.53664SRT2 139.53962SRT1 139.53670 139.53963 139.53670SRT1 139.53963SRT 139.53671 139.53964 139.53671SRT 139.53964SRT 139.53671SRT3 139.53966 139.53672 139.53966SRT 139.53672SRT 139.53966SRT1 139.53672SRT2 139.53974 139.53672SRT3 139.53974SRT 139.53673 139.53975 139.53673SRT 139.53975SRT 139.53673SRT3 139.53975SRT1 139.53674 139.53976 139.53674SRT1 139.53976SRT 139.53674SRT2 139.53978 139.53675 139.53978SRT 139.53675SRT2 139.53978SRT1 139.53677,

FCC: HBW1241

Replaces the following Models:

139.53661
139.53661SRT
139.53661SRT3
139.53662
139.53662SRT2
139.53663
139.53663SRT
139.53664
139.53664SRT
139.53664SRT2
139.53670
139.53670SRT1
139.53671
139.53671SRT
139.53671SRT3
139.53672
139.53672SRT
139.53672SRT2
139.53672SRT3
139.53673
139.53673SRT
139.53673SRT3
139.53674
139.53674SRT1
139.53674SRT2
139.53675
139.53675SRT2
139.53677
139.53677SRT
139.53677SRT3
139.53680
139.53681
139.53681B
139.53684
139.53910D
139.53914
139.53919
139.53954
139.53961
139.53961SRT
139.53962
139.53962SRT
139.53962SRT1
139.53963
139.53963SRT
139.53964
139.53964SRT
139.53966
139.53966SRT
139.53966SRT1
139.53974
139.53974SRT
139.53975
139.53975SRT
139.53975SRT1
139.53976
139.53976SRT
139.53977SRT
139.53978
139.53978SRT
139.53978SRT1
139.53985
139.53990
139.53992SRT
139.53995SRT

Originally supplied with models: 139.53661, 139.53661SRT, 139.53661SRT3, 139.53662, 139.53662SRT2, 139.53663, 139.53663SRT, 139.53664, 139.53664SRT, 139.53664SRT2, 139.53670, 139.53670SRT1, 139.53671, 139.53671SRT, 139.53671SRT3, 139.53672, 139.53672SRT, 139.53672SRT2, 139.53672SRT3, 139.53673, 139.53673SRT, 139.53673SRT3, 139.53674, 139.53674SRT1, 139.53674SRT2, 139.53675, 139.53675SRT2, 139.53677, 139.53677SRT, 139.53677SRT3, 139.53680, 139.53681, 139.53684, 139.53961, 139.53961SRT, 139.53962, 139.53962SRT, 139.53962SRT1, 139.53963, 139.53963SRT, 139.53964, 139.53964SRT, 139.53966, 139.53966SRT, 139.53966SRT1, 139.53974, 139.53974SRT, 139.53975, 139.53975SRT, 139.53975SRT1, 139.53976, 139.53976SRT, 139.53978, 139.53978SRT, 139.53978SRT1, 950CB, 953CB, 956CB, HBW1241, M50

Dimensions: 3.00 x 2.00 x 1.00 (W x L x D, inches)