(Most manufacturers allow a 30 to 60-day trial period during which aids can be returned for a refund.
(ຜູ້ຜະລິດສ່ວນໃຫຍ່ອະນຸຍາດໃຫ້ໄລຍະທົດລອງ 30- ເຖິງ 60-day ໃນໄລຍະທີ່ເຄື່ອງຊ່ວຍເຫຼືອສາມາດສົ່ງຄືນໄດ້ ສໍາ ລັບການສົ່ງເງິນຄືນ.)