Shengfu 14A Headset Wireless Microphone

Specifications: Model: W-14A Working time: 6hours Charging time: 2.hours Material: Aluminum Alloy & ABS Transmission range: up to 150 feet (50m) Power supply: USB5V500MA-1A Wireless microphone: Frequency band A: 600MHz-649MHz Frequency band B: 650MHz-699MHz Receiver: Frequency band A: 600MHz-649MHz Frequency band B: 650MHz-699MHz RF power: 10dBM Frequency response range: 50Hz-15KHz Microphone core type: capacitive microphone Battery type: 3.7V lithium battery 400mAh x 2 18650 battery: 1200mAh