Replacement Battery Pack Extended Range Li-Ion Battery Life 36 hr Color Black For Use With Mfr No MX6-K1230101 MX6-K0230101 MX6-K1030101 MX6-K0030101 MX6-K1230301 MX6-K0230301 MX6-K1030301 MX6-K0030301 MX6-K1230111 MX6-K123R211 MX6-K103Q211 MX6KIT-K1230111 MX6KIT-K123R211 MX6-K1230211 MX6KIT-K1230211 Operating Temp Range -4 Degrees to 122 Degrees F (-20 Degrees to 50 Degrees C) Voltage 3.7V DC