Yes but caveat emptor, the bluetooth support in FreeBSD isn't that good really and hangs very often or causes disconnects without any good reason.
kpa is right regarding FreeBSD's sub-optimal Bluetooth support. But at least I can use an Apple Wireless Keyboard, so the Lenovo one should also work.
I used my notebook's internal bluetooth device so I cannot recommend any USB dongle.
Jun 13 10:49:25 planc devd: Executing '/etc/rc.d/bluetooth quietstop ubt0'
Jun 13 10:49:40 planc kernel: ugen0.6: <Sweex> at usbus0
Jun 13 10:49:40 planc kernel: ubt0: <Sweex BT204 Bluetooth Micro Adapter Class, class 224/1, rev 2.00/52.76, addr 17> on usbus0
Jun 13 10:49:40 planc devd: Executing '/etc/rc.d/bluetooth quietstart ubt0'
Jun 13 10:49:47 planc admin: /etc/rc.d/bluetooth: ERROR: Unsupported device:
Jun 13 11:03:06 planc devd: Executing '/etc/rc.d/bluetooth quietstart ubt0'
Jun 13 11:03:06 planc devd: Executing 'logger Unknown USB device: vendor 0x0a5c product 0x2148 bus uhub2'
Jun 13 11:03:06 planc root: Unknown USB device: vendor 0x0a5c product 0x2148 bus uhub2
Jun 13 11:01:53 planc devd: Executing '/etc/rc.d/bluetooth quietstart ubt0'
Jun 13 11:01:53 planc devd: Executing 'logger Unknown USB device: vendor 0x050d product 0x016a bus uhub2'
Jun 13 11:01:53 planc root: Unknown USB device: vendor 0x050d product 0x016a bus uhub2
Jun 29 19:31:55 box kernel: ugen1.5: <Broadcom Corp> at usbus1
Jun 29 19:31:55 box devd: Executing 'kldload -n ng_ubt'
Jun 29 19:31:55 box devd: Executing 'kldload -n ng_ubt'
Jun 29 19:31:55 box kernel: ubt0: <Broadcom Corp BCM20702A0, rev 2.00/1.12, addr 5> on usbus1
Jun 29 19:31:55 box devd: Executing 'logger Unknown USB device: vendor 0x0a5c product 0x21ec bus uhub3'
Jun 29 19:31:55 box root: Unknown USB device: vendor 0x0a5c product 0x21ec bus uhub3
Jun 29 19:31:55 box devd: Executing 'logger Unknown USB device: vendor 0x0a5c product 0x21ec bus uhub3'
Jun 29 19:31:55 box root: Unknown USB device: vendor 0x0a5c product 0x21ec bus uhub3
Jun 29 19:31:55 box devd: Executing '/etc/rc.d/bluetooth quietstart ubt0'
Jun 29 19:31:55 box kernel: WARNING: attempt to domain_add(bluetooth) after domainfinalize()
Jun 29 19:31:55 box kernel: WARNING: attempt to domain_add(netgraph) after domainfinalize()
Which version of FreeBSD are you using?
product BROADCOM BCM20702A0 0x21ec BCM20702A0 Bluetooth USB dongle
/* Broadcom BCM20702A0 */
{ USB_VPI(USB_VENDOR_ASUS, 0x17b5, 0) },
{ USB_VPI(USB_VENDOR_ASUS, 0x17cb, 0) },
{ USB_VPI(USB_VENDOR_LITEON, 0x2003, 0) },
{ USB_VPI(USB_VENDOR_FOXCONN, 0xe042, 0) },
{ USB_VPI(USB_VENDOR_DELL, 0x8197, 0) },
{ USB_VPI(USB_VENDOR_BROADCOM, 0x21ec, 0) },
Sep 4 12:39:16 nas kernel: ugen0.7: <Broadcom Corp BCM20702A0> at usbus0
Sep 4 12:39:16 nas kernel: ubt0 numa-domain 0 on uhub2
Sep 4 12:39:16 nas kernel: ubt0: <Broadcom Corp BCM20702A0, rev 2.00/1.12, addr 8> on usbus0
Sep 4 12:39:17 nas root: Unknown USB device: vendor 0x0a5c product 0x21ec bus uhub2
Sep 4 12:39:17 nas root: Unknown USB device: vendor 0x0a5c product 0x21ec bus uhub2
Sep 4 12:39:57 nas : /etc/rc.d/bluetooth: ERROR: Unable to setup Bluetooth stack for device ubt0
Sep 4 12:40:07 nas kernel: ng_hci_process_command_timeout: ubt0hci - unable to complete HCI command OGF=0x3, OCF=0x3. Timeout
Sep 4 12:40:09 nas : /etc/rc.d/bluetooth: ERROR: Unable to setup Bluetooth stack for device ubt0
# kldstat
Id Refs Address Size Name
1 84 0xffffffff80200000 1f67a88 kernel
2 1 0xffffffff82169000 316708 zfs.ko
3 2 0xffffffff82480000 cb78 opensolaris.ko
4 1 0xffffffff8248d000 21f08 geom_eli.ko
5 1 0xffffffff824af000 44bd8 ipfw.ko
6 1 0xffffffff824f4000 1afec8 sfxge.ko
7 1 0xffffffff826a4000 4d18 coretemp.ko
8 1 0xffffffff826a9000 bd50 aesni.ko
9 1 0xffffffff826b5000 4d78 uslcom.ko
10 3 0xffffffff826ba000 a9b8 ucom.ko
11 1 0xffffffff826c5000 35b060 vmm.ko
12 1 0xffffffff82c21000 5936 fdescfs.ko
13 1 0xffffffff82c27000 bdb0 if_lagg.ko
14 1 0xffffffff82c33000 38c0 umodem.ko
15 1 0xffffffff82c37000 2986 uhid.ko
16 1 0xffffffff82c3a000 3650 ums.ko
17 1 0xffffffff82c3e000 3123 nmdm.ko
18 1 0xffffffff82c42000 9a4c if_bridge.ko
19 1 0xffffffff82c4c000 5e61 bridgestp.ko
20 1 0xffffffff82c52000 59c6 if_tap.ko
21 1 0xffffffff82c58000 864c ipmi.ko
22 1 0xffffffff82c61000 f7f smbus.ko
23 1 0xffffffff82c62000 a877 linprocfs.ko
24 1 0xffffffff82c6d000 7b0f linux_common.ko
25 1 0xffffffff82c75000 6679 nullfs.ko
27 5 0xffffffff82c81000 c57d netgraph.ko
28 2 0xffffffff82c8e000 a6bd ng_hci.ko
29 3 0xffffffff82c99000 107f ng_bluetooth.ko
30 1 0xffffffff82c9b000 d5be ng_l2cap.ko
31 1 0xffffffff82ca9000 1c393 ng_btsocket.ko
32 1 0xffffffff82cc6000 39cc ng_socket.ko
33 1 0xffffffff82c7c000 360b ng_ubt.ko
[ 2.966713] usb 5-2: Product: BCM20702A0
[ 2.966766] usb 5-2: Manufacturer: Broadcom Corp
[ 2.976651] Bluetooth: hci0: BCM: chip id 63
[ 2.978593] Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
[ 2.981720] bluetooth hci0: Direct firmware load for brcm/BCM20702A1-0a5c-21ec.hcd failed with error -2
[ 2.981788] Bluetooth: hci0: BCM: Patch brcm/BCM20702A1-0a5c-21ec.hcd not found
$ dmesg |grep -i bluetooth
[ 1.670030] Bluetooth: Core ver 2.20
[ 1.670128] Bluetooth: HCI device and connection manager initialized
[ 1.670179] Bluetooth: HCI socket layer initialized
[ 1.670227] Bluetooth: L2CAP socket layer initialized
[ 1.670278] Bluetooth: SCO socket layer initialized
[ 2.708083] Bluetooth: HCI UART driver ver 2.3
[ 2.708130] Bluetooth: HCI UART protocol H4 registered
[ 2.708192] Bluetooth: HCI UART protocol BCSP registered
[ 2.708239] Bluetooth: HCI UART protocol LL registered
[ 2.708287] Bluetooth: HCI UART protocol ATH3K registered
[ 2.708335] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 2.708384] Bluetooth: HCI UART protocol BCM registered
[ 2.709173] Bluetooth: RFCOMM TTY layer initialized
[ 2.709223] Bluetooth: RFCOMM socket layer initialized
[ 2.709275] Bluetooth: RFCOMM ver 1.11
[ 2.709323] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[ 2.709372] Bluetooth: HIDP socket layer initialized
[ 2.710833] Bluetooth: Starting self testing
[ 2.735652] Bluetooth: ECDH test passed in 24151 usecs
[ 2.736592] Bluetooth: SMP test passed in 51 usecs
[ 2.736663] Bluetooth: Finished self testing
[ 2.975625] Bluetooth: hci0: BCM: chip id 63
[ 2.977618] Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
[ 3.773599] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1460
[ 7.762846] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 7.762852] Bluetooth: BNEP filters: protocol multicast
[ 7.762861] Bluetooth: BNEP socket layer initialized