inputs.text: convenient eats watch batteries - pros small easy use inexpensive durable clip stand nice variety beats well click not annoying display also nice light hand movehement cons not turn loud goes watch batteries quickly not know 2032 watch batteries not normally sitting around not like 9v aa even lowest volume goes one every couple months daily use put sound powered speaker systehem headphones batteries not get used quicky hear not suspect would eat batteries quickly nothing like practicing band metronome suddenly dies no batteries available would go db 60 uses aa 90 uses 9v ac power look yamaha fact shopping db 90 write