· KFD products are CE / FCC / RoHS certified,Warranty: 30 Days Free Exchange /36 Months Warranty· Input: 100-240V 50-60Hz Output: 12V DC(9V Compatible); ✅[Quality Certified] OVP, OCP, SCP Protection (OVP: Over Voltage output Protection. OCP: Over Current output Protection. SCP: Short Circuit output Protection).· ✅[for RockJam 88-Key Charger] Compatible with RockJam Rock Jam RJ88DP RJ88 DP RJ 88DP RJ 88 DP 88 Key Digital Piano Keyboard Beginner with Full Size Semi-Weighted Keys 12V DC Power Supply Adapter· ✅[for 12V RockJam Keyboard Charger] Compatible with RockJam Rock Jam RJ761 RJ-761 61 Key Electronic Interactive Teaching Piano Keyboard RJ761SK RJ761-SK 12VDC Adapter Power Supply Cable Cord· ✅[for RockJam 61-Key Piano Keyboard Charger] Compatible with RockJam 61-Key 561 RJ561 RJ-561 661 RJ661 RJ-661 RJ761-SK,54-Key 654 RJ654 RJ-654 RJ6544 Rock Jam Electronic Digital Piano Keyboard 9V - 12V Power Supply