PROWAVE S40000 Crystal, 40 kHz, Cylinder Radial, 8mm x 3mm Dia, 45 ppm, 12.5 pF, 60 ppm Middle Atlantic BRK6 it means the battery is

it means the battery is low

Perfect for Detail/Insects

but is short to specifically support DSLR cameras

HF: 104 dB SPL/900 Hz to 5 kHz Nominal Impedance 8

Fits the Sony ECM-77 Lav Mic

PROWAVE S40000 Crystal, 40 kHz, Cylinder Radial, 8mm x 3mm Dia, 45 ppm, 12.5 pF, 60 ppm Middle Atlantic BRK6 it means the battery isThis is a Crystal, 40 kHz, Cylinder Radial, 8mm x 3mm Dia, 45 ppm, 12. 5 pF, 60 ppm product from PROWAVE with the model number S40000Product details Crystal Case Cylinder Radial, 8mm x 3mm Dia Frequency Tolerance + 60ppm Frequency Stability + 45ppm Operating Temperature Min 10C Product Range Load Capacitance 12. 5pF Operating Temperature Max 70C Frequency Nom 40kHz Other details Brand PROWAVE Part Number S40000 Quantity Each Technical Data Sheet EN