Packed with features, the dual channel 5-mode digital TENS Unit provides maximum therapy compared to traditional analog machines making it the Ultimate in pain management. The mild adjustments ensures proper treatment as instructed by a therapist or doctor. Modulation selector offers 5 waves modes of wave delivery including normal, burst and 3 modulation modes. Comes complete with carrying case, 2 lead wires, 9 -volt battery, 1 package of 4 pre-gelled electrodes (replacement electrodes #A2099 sold separately) and operating manual. 9 1/2"l x 7 1/2"W x 2 1/2"H. This item ships from a separate warehouse and will arrive in a separate package.