RAK-SL3001P, A possible substitute is RAKSL305P
P/N: RAKSL3001P, SLPC20, SLPC25
Originally supplied with models: SLPC14, SLPC15, SLPC20, SLPC20PK, SLPC25, SLPC30, SLPC326PQK, SLPC33, SLPC45
Battery Required : AAA Battery 2 pack
Dimensions: 2.00 x 6.00 x 1.00 (W x L x D, inches)