Features Free shipping (Delivery time: 5-15 days) Real digital signal transmission with very stable and clear audio quality Longer distance with high confidentiality and anti-interference. FCC Complied Integrated rechargeable Lithium battery, only 4 hours charging time. Easy to use battery charger. LCD display screen 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. Light weight and small size. Description Product Description Color: 4 transmitters + 60 receivers Real digital signal transmission with very stable and clear audio quality. Longer distance with high confidentiality and anti-interference Specifications of Wireless Audio tour guide system: It is a better way to provide tours for your tour groups. Audio tour guide system is an easy-to-use wireless communication system designed specifically for tour groups, factory tours, outdoor excursions, employee training, language interpretation, conferences and trade shows. Technical Specification of Audio guide system: 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 more than 100 groups work simultaneously at the same location. Back with belt clamp for easy carrying. Slim design and nice looking. Very small size Aapplications of audio tour guide system: Travel & Tourism: Tourism, museums, galleries, business and tour guides to explain the convention; VIP reception: The promotion of company's products, high-level exhibition, the Government, the reception of VIPs visited the factory, industrial tourism; Teaching training: Schools, training institutes, conference rooms, auditorium, classroom lectures, seminars and other learning activities, special job training. Package Included: 1 x Microphone for each transmitter 1 X Earphone for each receiver 1 x single USB charger for each device