Okara Rechargeable WB-171 Personal Sound Amplifier is a rechargeable device operated by one 1.2V NiMH button cell never needed to replace, the device may be charged up either by alternating current using AC Adapter for day-to-day use or by one triple-A al

Okara Rechargeable WB-171 Personal Sound Amplifier is a rechargeable device operated by one 1.2V NiMH button cell never needed to replace, the device may be charged up either by alternating current using AC Adapter for day-to-day use or by one triple-A alkaline battery for backup power while on the go Review