Experience targeted pain relief for lower back pain, sciatica, muscle spasms, and SI joint pain with the Chirp Halo Wireless Muscle Stimulator. This compact, wireless device provides effective relief by stimulating muscles to alleviate soreness, improve mobility, and promote ...Experience targeted pain relief for lower back pain, sciatica, muscle spasms, and SI joint pain with the Chirp Halo Wireless Muscle Stimulator. This compact, wireless device provides effective relief by stimulating muscles to alleviate soreness, improve mobility, and promote recovery.