Here's what LR Baggs have to say about the M1 Passive:
Available in completely passive design, the M1 delivers professional amplification in minutes. Adjustable pole pieces provide balance from string to string and the 1/8” jack makes removing the pickup a snap for when you are in the studio. Install the pickup with the strapjack or use the 10’ external soundhole cable for absolutely no modifications to your prized instrument.
- Highly Feedback-resistant
- Adjustable pole pieces
- A perfect blend of string and body signalQuiet hum-free operation
- Quiet hum-free operation
- Built-in gold plated 1/8" jack
- Includes a pre-wired strapjack harness and 10' cable for no modifications