The Mitsubishi ML720J11S-03 are DFB (Distributed Feedback) laser diodes emitting light beam with emission wavelength around 1310 nm.
They are well suited for light source in long distance digital transmission systems.
They are hermetically sealed devices with the photo diode for optical output monitoring.

 These are new diodes, individually characterized, in factory envelopes.

SPECIFICATIONS:

Output Power: 5 mW
Wavelength: 1310 nm typical, +/-3 nm
Operating Voltage: 1.1 Volts typical
Threshold Current: 6 mA typical
Operating Current: 16 mA typical
Monitor Current: 200 uA typical
Package: TO-18, 5.6 mm diameter base.

 A factory spec sheet can be found HERE

Note:
Due to the sensitive nature of laser diodes, there is no warranty or exchanges on these items.