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Triboelectric nanogenerator (TENG), as an emerging technology for distributed energy harvesting, provides a promising energy solution for selfpowered environmental monitoring. However, the abrasion of triboelectric materials lowers the output performance of TENGs, severely limiting their practical applications. Herein, a novel travel-controlled approach, by combining a gear train and cam switch, is proposed to reduce the mechanical wear. The automatic switching between the contact and non-contact modes can be achieved in a tunable frequency, showing excellent electrical stability by maintaining 90% of electric outputs after continuous operation for 80 h (1 920 000 cycles). Meanwhile, based on the structural optimization, the power density per unit wind speed of the travel-controlled TENG (TC-TENG) is doubled as compared with that of previous related works. Moreover, by integrating the triboelectric-electromagnetic hybrid device with an energy management circuit, a self-powered close-looped environmental monitoring and alarming system are demonstrated. Under breezy conditions (below 3 m s −1 ), the system can detect the environmental information continuously and steadily, and transmit it wirelessly to a mobile device. This work renders a novel approach to reducing the wear in TENGs toward self-powered wireless sensing systems, showing broad application prospects in distributed unmanned environmental monitoring, smart farming, and Internet of Things.