VITAI VT-5188 Durable Single Band DTMF-2tone-5toneNote:1.Please contact us at first time for bulk order.More discount waits for you.2.Please inform us beforehand if you want to reduce invoice value shows to your customs.About us:1.Professional in this field for 13 years; Good reputation as an gold supplier at Alibaba for 6 years;2.OEM service offered, we can design the packing box and LOGO mark as your request.VITAI VT-5188 Durable Single Band DTMF-2tone-5tone