Power button: Press and hold for 2 seconds to turn on or off. Status indicator light: Green light remains on when powered. Transmitter USB Audio IN/Power input port: USB audio data input and 5V power supply, compatible with 5V 1A power adapter. Transmitter audio input port: 3.5mm analog audio input. Receiver Power input port: 5V power supply, compatible with 5V 1A power adapter. Receiver audio output port: 3.5mm analog audio output. Pairing button: Factory-paired; no re-pairing required under normal use. Frequency Range: 580MHz–680MHz. Transmitting power: 15dBm @ AB-50. Receiving sensitivity: -98dBm. Audio frequency response: 20Hz–20kHz. Signal-to-noise ratio: 100dB. Sampling Rate: 96kHz. Transmission delay: 4.5ms. Operating Voltage: 5V. Transmitter operating current: ≤180mA @ AB-50. Receiver operating current: ≤125mA. Due to product batch variations, appearance may vary slightly without affecting functionality. Color: Black. Material: ABS. Package Contents: 1 x Transmitter, 1 x Receiver, 2 x Type-C cables, 1 x 3.5mm audio cable. Product includes only the items listed. Note: Display lighting and screen settings may cause slight color differences between image and actual item. Measurement error allowed: +/- 1–3cm.