Features: *Clearer talking and longer range, stable performance. *16 channels adjustable, 400-470MHz working frequency. *Noise Reduction, Battery Saving, Flashlight. *Time-out Alarm, Voice Prompt, Voice Operated Transmission. *Built-in 4PCS for your normally talking use. Specifications: Frequency: UHF 400-470MHz Channel Capacity: 16 Power Consumption: 5W Battery Capacity: 3.7V 1500mah Working Distance: 1-6Km Size: 115*60*33mm Package List: 4 * Transceiver 4 * Antenna 4 * Battery 4 * Belt Clip 4 * EU Charger 4* String 4 * English Manual