GWS BE FOUND: #01/FP
[BF01/J]

Model : BF-1
Dimension - 40 x 21x 16 mm /1.58x0.83x0.63 in
Weight - 9.4 g / 0.34 oz
Normal Operation Voltage - 4.8V~7.2V (Max Voltage : 10.0V)
Power Consumption - 18mA (Stand-by) 65mA (While beeping)
Operating Temperature = (- 20 C ~ 60 C)