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RKI Instruments 66-6302-25-W AirLink T3A sensor/transmitter with j-box Explosion Proof 0-100 % LEL Ni-MH batteries 100-240 VAC / 12 VDC "This is a three-way winRKI Instruments 66 6302 25 W $3,689. 97 Save money NO state or local sales tax, free shipping. AirLink T3A sensor transmitter with j box Explosion Proof Oxygen (O2), 0 25% with 900 MHz radio AirLink T3A Wireless Transmitter, Wire Powered, Explosion Proof, No Relays Explosion Proof, Class I, Division 1 for CO, H2S, O2, LEL, & CO2 Class I, Division 2 for all other gases 12 35 VDC wire power Add R and $279 to add 2 relays Add Y for 2. 4 GHz