Z-Stone provide professional repeaters including: Broadband repeater/band silective repeater, channel selective repeater, in-band/outband frequency shifting repeater, fiber optical repeater, truck amplifier, micro repeater, PICO repeater, tower amplifier and BST amplifier. Z-stone modules including the following series: Low noise amplifier, power amplifier, frequency shifter, frequency selector, fiber optic transceiver, PICO module, driver amplifier, power supply,filter, duplexer, combiner, spliter and so on. Z-stone repeaters including the following series: CDMA,GSM,WCDMA,TD-SCDMA,TATRE/IDEN,SCDMA,PHS,GSM-R,WIMAX,GOTA, GT800 Z-stone provide various solutions on network optimization: Sea area coverage, ECS companding coverage system, auto optimization of urban network system, intelective network optimization system, multi-unit train network system