A. BS-Q8 series is a mini 2.4Ghz wireless microphone system suitable for live streaming, vlogging, course recording, and other audio capturing applications. B. BS-Q8-A is designed for iOS devices and comes with 2 transmitters and 1 receiver. C. BS-Q8-C is compatible with most Android devices with USB-C ports, including smartphones and tablets, and has 2 transmitters and 1 receiver. D. BS-Q8-2. USB-C includes 2 transmitters and 2 receivers, enabling simultaneous recording of two sound sources. Transmission distance: 10-30 meters Signal to noise ratio: 70dB Working current: 12mA Earphone monitoring: support Noise reduction: Supports three-level noise reduction Reverb: support Charging compartment battery: 300mA/H Frequency response: 20Hz-20KHz Adapters: 5V/1A Working temperature: -10°C-50°C Color: Black Material: ABS Package Contents: 1 * microphone set 1 * USB data cable Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The measurement allowed error is +/- 1-3cm.