To view the troubleshooting guide for this device visit this link Troubleshooting for iRobot Looj 120
The iRobot Looj 120 has a fast spinning auger located on the front of the device in order to clear debris that is found in gutters. It also has treads on either side of the robot in order for it to move through gutters when wet or when obstructed by leftover debris. It also has a handle that doubles as a remote control that has a radio signal of up to 75 feet.
This iRobot Looj is easily identifiable because of its green color signifying that it is the 120 model. It uses a 7.2 volt NiCad rechargeable battery that needs to be charged for 15 hours and has a battery life of 30-45 minutes. The 120 also has a three stage auger and a removable handle that is also a remote control for the device.