SANTAMEDICAL FEATURES✔ Eight Auto Modes (stimulation programs) and Pause button ✔ 10 to 60-minute timer with auto shut-off, 20-minute default setting ✔ Adjustable massage strength levels with gradual increase/decrease setting option ✔ Portable and Compact device is easy to bring along in a bag or a suitcase for on-the-go use ✔ Attachment pads, Rechargeable Battery, and Power Adapter includedDETAILSSantamedical PM-510 Rechargeable Tens Unit Electronic Pulse Massager is a compact, portable, micro-computer controlled device. It can be used in many areas in your body, including arms, neck, and shoulders, back, low back, legs, feet, joints, etc. It may help to relieve pain and numbness in the following situations: Stiff neck; Muscle pains from over-exercise or stretch; Numbness from some chronic condition; Carpal-tunnel syndrome; Relieve pain and relaxation muscle spasms, or may prevent muscle atrophy. Recharge the internal lithium battery to keep them powered up for massagesWHAT'S INSIDE THE BOX?Tens Unit handheld controller4 electrodesA TENS unit manualTENS Unit2 sets electrode wiresWall Unit ChargerUSB CablePad and Wires CollectorOperating Manual Package Dimensions: 6.5 x 4.5 x 2.5 inches