6. FIXED ASSETS

Fixed assets consist of the following:

Depreciation and amortization expense related to fixed assets was $851,516 and $925,039 for the years ended December 31, 2016 and 2015, respectively, of which $805,606 and $847,384, respectively, was recorded within cost of sales in the accompanying consolidated statements of operations.

On April 2, 2015, the Company was notified by a host to remove 304 level 2 charging stations from its various locations throughout the United States, installed by 350 Green prior to the Company’s acquisition of 350 Green which is currently owned by EVSE. The customer alleged material breaches by 350 Green of the Charging Station License Agreement between the parties. As a result of the notification, the Company performed an impairment test on those specific charging stations and concluded they were fully impaired. On July 10, 2015, the Company sold 142 of these charging stations with no remaining carrying value of $0 to a competitor for an aggregate purchase price of $106,700, resulting in a gain of $106,700 recorded in other (expense) income.

During the year ended December 31, 2015, the Company disposed of fixed assets with a net book value of $25,133 which resulted in a loss on disposal of $25,133 during 2015, which was included within other (expense) income in the consolidated statements of operations.

During the year ended December 31, 2016, the Company disposed of fixed assets with a net book value of $17,557 which resulted in a loss on disposal of $17,557 during 2016, which was included within other (expense) income in the consolidated statements of operations.