Alnico
BLACK PLASTIC: PRF-MH7-AB1
NICKEL: PRF-MH7-AN1
BRUSHED STAINLESS: PRF-MH7-AR1
BLACK NICKEL: PRF-MH7-AK1
WHITE: PRF-MH7-AW1
PEAK FREQUENCY: Voice 1: 630Hz
Voice 2: 550Hz / 8kHz
MAGNETIC MATERIAL: Alnico V
MAGNETIC CIRCUIT: Bar magnet with blades
GAUSS STRENGTH: 120 gauss strength at string
OUTPUT IMPEDANCE: 2k
CURRENT DRAW: 2.5mA
BATTERY: 9-Volt or optional rechargeable battery
BATTERY LIFE: Up to 200 hours
Ceramic
BLACK PLASTIC: PRF-MH7-CB1
NICKEL: PRF-MH7-CN1
BRUSHED STAINLESS: PRF-MH7-CR1
BLACK NICKEL: PRF-MH7-AK1
WHITE: PRF-MH7-AW1
PEAK FREQUENCY: Voice 1: 720Hz
Voice 2: 1.3kHz
MAGNETIC MATERIAL: Ceramic VIII
MAGNETIC CIRCUIT: Bar magnet with blades
GAUSS STRENGTH: 145 gauss strength at string
OUTPUT IMPEDANCE: 2k
CURRENT DRAW: 3mA
BATTERY: 9-Volt or optional rechargeable battery
BATTERY LIFE: Up to 170 hours