Flysoundtech Wireless Tour Guide System for Tour Guiding Simultaneous Translation Museum Visiting Coaching Church Assistive Listening System Package(2 Transmitters + 18 Receivers) Free shipping (Free shipping (Delivery time: 5-10 days from China.Generlly we will ship as quickly as possible)) Real digital signal transmission with very stable and clear audio quality Longer distance with high confidentiality and anti-interference Integrated rechargeable Lithium battery, only 4 hours charging time. Easy to use battery charger. LCD display for battery power, channel, volume, very easy to operate. UHF for international free frequency license. 100-150 meters range from the transmitter to receivers. 100 independent channels to choose, up to 100 groups work simultaneously at the same location. Lanyard provided for easy carrying. Slim design and nice looking. Light weight and small size.