This Replacement Soundhead Wand Applicator is compatible with the SoundCare Plus Ultrasound Unit. It features a 1cm head and is pre-calibrated, water resistant, and ergonomically designed for maximum effectiveness. The replacement head operates with 1 or 3 MHz ultrasound frequencies. This purchase includes a wand with both the head and cable attached. You can also check out the same product in 5 cm size.