They've been 25% since August 23, 2018. 8543.70.9960 is in Section 301 Tariff List 2. There have been no changes to List 2 tariffs. List 3 tariffs increased from 10% to 25% in May 2019 and List 4 tariffs did not increase to 25% yet. If you only order one unit at a time you may luck out with an informal entry (if below $2,500), customs classifying it wrong, and only paying 2.6%. All of my last orders through DHL were only charged 2.6% and liquidated as such. Comes down to the customs officer completing the paperwork for informal entries. Larger orders and formal entries you'll be paying the full 27.6%.