This optical audio to 3.5mm adapter is made of , which can withstand use. Features the PVC and optical fiber material, which has high durability, not easy to deform. Fine workmanship, ensures practicality. Features -Color:Black -Material:PVC, optical fiber - Size: 3.00X1.20X1.20cm/1.18X0.47X0.47in Digital input level: 0.1~1Volts p- /R analog output (1kHz@0dB): 800mVRMS Headphone output power (1kHz@0dBRL=32): 30mW SNR@0dB(CCIR/ARM):90dB Distortion: 0.1% Frequency response: 20Hz~20KHz Maximum working current: 350mA Power adapter specifications: input - 50/60Hz; DC output: 5V/1A Working temperature: -10~+55 degree centigrade Working humidity range: 5~90%RH (non-condensing) - L/R analog audio output and one headphone output. Using -bit audio DSP and 96KHZ/24bit DAC digital processing chip. - Power-off memory function, no need to signal sources after restarting. - Short press in power-on state to select the input signal source, long press for more than 3 seconds to power off. - Possess DC over-voltage power-off protection function to effectively prevent damage to the product when using the wrong power supply. - The product is light, portable, easy to use, and is a convenient and practical optical audio to 3.5mm adapter. Package list: 15 x optical audio to 3.5mm adapters