vintrons 3500mAh Battery For Rover Instruments ST-4, DM16C, DM16Q, Please ensure both model and battery part number are matched with your device. - Compatible Model: ROVER DM16C, DM16Q, Instruments ST-4, - Compatible Battery Part Number: ROVER BAT-PACK-ST4-DM16, - RoHS approved for toxic free. - CE and ISO9001 Certificate for quality assurance.