... Power Battery 7.4V,2500MAH/3.7V,5000MAH, Long Working Time. Sustain consecutive Working above 20 hours ... engine, Designed for 10 years using.8 Sensitive RFID (LF/HF/UHF) Module9 Wifi ( Standard), GPRS/3G(optional), ... 5m,Speed below 0.01m/sOptionalInternal LF/HF/UHF RFID ReaderOptionalInternal GPRS/3G WCDMA Power Main Power7.4V ... -Drop4 inch(1.2Meters)Multi Drop UHF RFID Handheld PDA Reader Barcode + Wifi