Abstract: A headphone includes two audio output devices and a headband connected between the two audio output devices. The headband includes a rubber block and at least one shape memory alloy wire. The shape memory alloy wire is at least partially embedded in the rubber block. The rubber block has at least one cutout.

Abstract: A headphone includes two audio output devices and a headband connected between the two audio output devices. The headband includes a rubber block and at least one shape memory alloy wire. The shape memory alloy wire is at least partially embedded in the rubber block. The rubber block has at least one cutout.

Abstract: A neck strap including at least one flexible circuit board, at least two fixing structures, a positioning element, a protecting layer, and a supporting element is provided. The at least two fixing structures are disposed on two opposite ends of the at least one flexible circuit board and has a housing. The positioning element is disposed in the housing and a through groove is formed between the housing and the positioning element. The protecting layer is at least partially sleeved around the positioning element, the at least one flexible circuit board, and the at least two fixing structures. The supporting element is disposed through the positioning element.

Abstract: A burn-in oven having an inverter fan and a heat regulator includes a housing, a frame, a heater, a temperature sensor, an inverter fan, and a control unit. The housing includes an air-in port and an air-out port. The frame is fixedly arranged inside the housing, and is divided into a variety of partitions. In addition, the heater and the temperature sensor are also fixedly arranged inside the housing. The inverter fan is provided for supplying a forced air-flow toward inside of the housing. The control unit is electrically connected with the temperature sensor, the heater, and the inverter fan. The control unit is provided for controlling the temperature inside the housing not to exceed a predetermined value. Thereby, the present invention saves energy and shortens effectively the time required for burn-in temperature rising and lowering, and saves working hours and manpower as well.