HO Electric Uncoupler Under-the-Ties Delayed-Action Fits any HO code track. Kadee® #165 Red - Normally Open momentary contact push button switches are recommend. Operates: 16 volt DC. We recommend a 16 volt DC power source (at least 3 Amps) or 18 volt AC power source (at least 3 Amps)converted to DC with bridge rectifier. For wiring instructions please refer to the #309 Electric Uncoupler Instructions. WARNING: Do not use the uncoupler continually. DO NOT activate the uncoupler for longer than 2 MINUTES at one time. This will avoid possible overheating which will damage the uncoupler. WARNING: CHOKING HAZARD - Small Parts - Not for children under 14 years. Kadee Quality Products Co. products are not toys and are not intended for children under 14 years old.