The JBL Partybox Wireless Mic (2-Pack System)

Battery Life: Up to 20 hours for microphones; up to 12 hours for the receiver.Connectivity: 2.4GHz digital wireless dongle with a range of approximately 30 meters (100 feet).Compatibility: Designed for all JBL PartyBox speakers.Features: Cardioid pickup pattern for clear vocals and a built-in foam pop filter to minimize noise.