Specifications Gigabit single fiber 1 optical 1 battery, a pair of 3km (3c power supply included) Gigabit single fiber 1 optical 1 battery, a pair of 20km (3c power supply included) Gigabit dual fiber 1 optical 1 electric pair 20km (3c power supply included) Gigabit single fiber 1 optical 2 batteries + 1 optical 1 battery, a pair of 20km (3c power supply included) Gigabit single fiber 1 optical 4 batteries + 1 optical 1 battery, a pair of 20km (3c power supply included) Gigabit single fiber 1 optical 8 batteries + 1 optical 1 battery, a pair of 20km (3c power supply included) Here are 2-light multi-optical transceivers Gigabit single fiber 2 optical 2 electrical sc one set 3km (free 3c power supply) Gigabit single fiber 2 optical 4 electrical sc one set 3km (free 3c power supply) Gigabit single fiber 2 optical 8 electrical sc one set 3km (free 3c power supply) Gigabit single fiber 4 optical 2 electrical sc one set 3km (free 3c power supply) Gigabit single fiber 8 optical 2 electrical sc one set 3km (free 3c power supply) Gigabit single fiber 16 optical 2 electrical sc one set 3km (free 3c power supply) Gigabit single fiber 24 optical 2 electrical sc one set 3km (free 3c power supply) The following is the 100m transceiver 100mbps dual fiber optic switch, 1 optical port, 1 electrical port, 25km pair (includes free 3c power supply) 100mbps single fiber 1 optical 1 electrical pair, 25km range (includes 3c power supply) 100mbps single fiber 1 optical 2 electrical + 1 optical 1 electrical pair, 25km range (includes 3c power supply) 100mbps single fiber 1 optical 4 electrical + 1 optical 1 electrical pair, 25km range (includes 3c power supply) 100mbps single fiber 1 optical 8 electrical + 1 optical 1 electrical pair, 25km range (includes 3c power supply)