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Donner 9 Volt Adapter The Donner 9 Volt Adapter works with any device requiring tip negative 9V to minimize or eliminate the need to change batteries. It can also be used to power additional 9V tip negative effects pedals. No Need for Batteries Dealing with a dead battery in your pedalboard can ruin a performance. With the 9 Volt Adapter you can avoid the headaches of a dead pedal by directly powering it. Not Just for Pedals The 9 Volt adapter isn't just for powering pedals, it can also be used for other manufacturers electronics. The Donner adapter can also be used to power tip negative keyboards.