LR Baggs M1A - Manual (Page 6)

When adjusting the pole pieces downward you will meet
additional resistance when you reach the bottom of the
adjustment range. Do not force the pole pieces any further! This
could damage the pickup permanently.
5 . S P E C I F I C AT I O N S :
Battery type: CR2032
Battery life: 1000+ hours
Current consumption: 135 uA
Preamp signal to noise: -78dB unweighted
Output level: -10dB
Output impedance: 800 ohms