This sale includes the Revolabs 02-04HDCHG-C charging base for 4 microphones, power supply and (4) 01-HDTBLMIC-DR-11 microphones. Batteries take a charge, but will require replacement as they do not hold the charge for more than 5 minutes. Batteries can be purchased direct form Revolabs. Rubber parts have become a bit sticky, but should clean up with light cleaning solution. Requires a Revolabs Executive HD Receiver (not included in sale) to operate. Microphones can be paired to existing receivers as spares if needed. Buyer to pay within 3 days of sale close. Domestic USA Shipping only.