The 16876 (ENC200 & TW AC Power Transformer) is used with the ENC200 and 16869 sealed rechargeable battery. The 16876 includes a 20 ft power cable and a wall transformer. One end of the power cable attaches to the ENC200 power connector, and the other end attaches to the wall transformer. The wall transformer has a 6 ft cable that plugs into an ac wall socket. To use this transformer kit, ac power must be available at the ENC200 location.