Trine 276 (Like Edwards 730, Lee 101) Fully Enclosed Bell & Buzzer Low Voltage Combination Door Bell 3-8 VDC/6-8 VAC, Attractive snap on covers, Fully enclosed, Grey finish. The Cat. No. 276 is a low cost, fully insulated, non adjustable Bell & buzzer with grounded frame. May be operated using AC power supplied by a 590 transformer or from DC power. Universal economy buzzer or bell and buzzer combination widely used in homes, apartment houses, plants, and OEMs.