The Wireless Collar Clip Microphone features of 15ms ultra-low latency, smart noise cancellation, long working time, sound and picture synchronization, KTV Reverb, tiny and portable, real-time monitoring, 360 degree omnidirectional microphone, clear to pickup. Specifications: Type: 1 Transmitter, 1 Receiver / 2 Transmitters, 1 Receiver (Optional) Material: ABS Pointer Type: Omnidirectional Frequency Range: 2.4G Frequency Range: 50Hz-18KHz Transmission Distance: 15-25m Signal to Noise Ratio: >64dB Battery Capacity: 3.7V 200mAh Charging Interface: Type-C Rated Input: DC5V-200mA Standard Charging Time: Approx. 2 hours Length of Work: 12-15 hours Standby Battery Life: 100 hours Operating Temperature: -10~45 Storage Temperature: -20~60 Item Size: 47 * 43 * 10.6mm / 1.85 * 1.69 * 0.42in Item Weight(Single RX/TX): 21g / 0.74oz Package Weight: 113g / 4.01oz, 139g / 4.91oz Package Size: 14.7 * 8.2 * 3.7cm / 5.79 * 3.23 * 1.46in, 20.2 * 8.2 * 3.2cm / 7.95 * 3.23 * 1.26in Package List: 1/2 * Transmitter (options) 1 * Receiver 1 * Audio Cable 1 * Type-C Cable 1 * Manual (English)